surprise appearance in court. and joe biden's emotional message of support for his son. plus, the potential witnesses. could his brother, beau's widow be called to the stand? all this four days after his father's 2024 rival donald trump was convicted on all 34 counts in his hush money trial. the new comments from mr. trump slamming his sentencing date. also tonight, nbc news learning president biden plans to sign a sweeping executive action on the border. what it would give him the power to do. wildfires burning, thousands of acres in california with a dangerous heat wave on the way. dr. anthony fauci grilled on capitol hill by republicans on the origin of covid. the moment he choked up describing death threats against his family and tensions erupting. marjorie taylor greene refusing to call him a doctor. four more israeli hostages confirmed dead as president biden turns up the pressure on israel for a cease-fire deal saying, quote, the deal must get done. and after decades of decline, what's driving the motor city's big comeback? this is "nbc nightly news" with lester holt. >> good evening, and welcome. days after the first criminal conviction of a former president, another first is unfolding tonight in delaware where hunter biden has become the first offspring of a sitting president to face criminal charges. the trial began today for the president's son who stands accused of three federal counts related to gun possession. hunter biden has pleaded not guilty. today was jury selection with lawyers questioning dozens of prospective jurors before seating a panel late today. in the courtroom for most of the day, first lady jill biden. in a statement, the president avoiding direct comment on the case but affirming the first couple's support for their son, saying "we are so proud of the man he is today." ryan nobles is covering the trial. >> reporter: tonight for the first time in american history, the child of a sitting president is facing a criminal trial, and now the 12-member jury is set. six men and six women, including six jurors who own guns themselves or have family members that purchased them recently. hunter biden, accused of lying on a federal form in 2018 to purchase a gun, checking a box saying he was not an active drug user. despite acknowledging in his book he was addicted to crack-cocaine at the time. first lady jill biden making a surprise appearance, sitting just a few feet behind her son in court. and the president offering his support saying, "as the president, i don't and won't comment on pending federal cases, but as a dad i have boundless love for my son." president biden spending memorial day weekend with hunter, and recently inviting him to state dinners and defending him publicly. >> first of all, my son's done nothing wrong. i trust him. i have faith in him. >> reporter: but his son's legal battles likely to take a political toll on the president in the midst of a re-election campaign. hunter's original plea bargain, which would have resulted in no prison time, was blasted by republicans as a sweetheart deal, and it fell apart under a judge's scrutiny. special prosecutor david weiss then charging him for both tax and gun crimes to which hunter biden has pleaded not guilty. weiss saying he'll rely on hunter's laptop, writing the defendant's laptop is real, it will be introduced as a trial exhibit, and it contains significant evidence of the defendant's guilt. prosecutors also expected to call hallie biden who hunter was dating when the handgun was discovered. she's the widow of his brother beau. >> we understand this trial is not expected to last long. >> reporter: that's right, lester. we expect this trial to last about a week or maybe a little bit longer with opening statements set to begin tomorrow morning. we don't know yet if hunter biden will testify in this case, but if convicted he is facing jail time. >> ryan nobles, thank you. also tonight former president trump slamming his sentencing date set by a judge for just days before the republican convention as the biden campaign accused him of calling for violence if he's sentenced to jail. here's gabe gutierrez. >> reporter: tonight former president trump is blasting his sentencing date in july just days before the republican national convention. >> that's part of the game. >> reporter: and saying he was initially surprised by last week's guilty verdict. >> it was weird because we go in, and the judge -- it looked like it was a hung jury for a while. >> reporter: the new comments out today as the former president has seen a flood of campaign donations following his conviction on 34 counts of falsifying business records related to hush money payments to stormy daniels. he now says he plans to appeal, posting "the supreme court must decide," and he was asked about revenge. >> revenge will be success -- i mean that. but it's awfully hard when you see what they've done. >> reporter: and the potential for prison time. >> i'm okay with it. >> reporter: he could get probation or up to four years behind bars, though that's unlikely. >> i'm not sure the public would stand for it. i think it would be tough for the public to take. you know, at a certain point there's a breaking point. >> reporter: the biden campaign is seizing on that, accusing mr. trump of teeing up political violence, and now escalating its attacks, branding the former president a diminished man, white-collar crook, and convicted felon. >> we're going to remind people who donald trump is. >> reporter: but most republicans are rallying around him. a new poll shows just one in ten say they're less likely to vote for him after his conviction. >> and gabe, a big question is how lasting the impact of this verdict will be on the race. >> reporter: yes, lester. the trump campaign is arguing it is having a big short-term impact. the campaign says it and the rnc raised $141 million in may, a large chunk after the conviction. overall the biden campaign has been ahead in fundraising. >> all right, gabe gutierrez, thank you. facing high numbers of migrant crossings at the border, nbc news has learned president biden is expected to take executive action tomorrow. that would be right on the heels of mexico's historic presidential election. telemundo's julio vaquero is in mexico city. >> reporter: facing mounting pressure over his handling of the border, nbc news has learned that the biden administration is expected to announce a sweeping executive action that would allow the president to temporarily shut down the border if the number of illegal crossings reaches 2,500 a day, according to three people to familiar to the discussions. there are currently more than 4,000 illegal border crossings every day according to homeland security, suggesting a shutdown could go into effect immediately. this policy is a reversal from the president's stance in january. >> i've done all i can do. >> reporter: with the presidential election approaching, mr. trump routinely slams president biden over his handling of the border. >> they're pouring through every state, every state is now a border state. >> reporter: now president biden is trying to institute restrictions similar to those mr. trump tried to enact in 2018 which courts struck down. >> this really what sounds like a draconian and potentially unlawful immigration shutdown of the border. >> reporter: this announcement on the heels of history in mexico. >> mexico! [ cheers ] >> reporter: claudia sheinbaum won yesterday's presidential election becoming the first woman and the first jewish president in the country's 200-year history. the climate scientist and former mayor of mexico city will now be tasked with working with the u.s. to contain the flow of migrants at the border. >> i'm sure we're not going to have any major announcements of changes or proposals until it's defined by who's the next president of the united states. >> reporter: today president biden spoke with the president elect. as for tomorrow's executive action, t expected to include some exceptions, humanitarian exceptions, including one for unaccompanied children. >> julio vaquero, thank you. >> reporter: in aefl california a wind-driven wildfire forced evacuations and shut down a major highway this weekend. it's an early start to fire season as the first major heat wave begins. dana griffin is in tracy, california. dana, how serious is the threat? >> reporter: extremely serious. firefighters battling this blaze all weekend, but the risk is not over as a heat wave stretching across much of the southwest threatens to produce additional wildfires. frightening images of a wind-fueled wildfire in northern california's san joaquin county nearly 60 miles east of san jose. families forced to evacuate under heavy smoke. >> the flame was actually lapping up on the side of the trailers and the side of my car. >> reporter: this house, the only one to go up in flames, now a charred reminder of what once stood. the corral fire driven by 40 mile-per-hour winds started saturday afternoon near the lawrence livermore national laboratory. two firefighters were injured as more than 14,000 acres burned. the cause unknown. this week marks the first significant west coast heat wave of the year, coming off the heels of a wet winter. there's a lot more vegetation to burn. heat alerts are in effect for 23 million people across the southwest including california, nevada, arizona, and texas. temperatures expected to soar 20 degrees above average. >> this could be a heat wave that lasts for ten days or longer. so the impacts of the heat wave this significant, this early are probably greater than they would be, say, if we saw the same temperatures in july or august. >> reporter: a vastly different weather pattern taking shape in the pacific northwest. a pair of atmospheric rivers dumping heavy rain in washington, causing multiple collisions and snarling traffic during the morning commute. from heavy rain to wildfires, just the beginning of a whacky week of west coast weather. dana griffin, nbc news, tracy, california. and we are also tracking severe storms tonight across the middle of the country. 16 million people in the risk zone from southern plains and lower mississippi valley to parts of the midwest. cities that could see impacts include dallas, fort worth, oklahoma city, shreveport, and little rock. now to the combative day on capitol hill. dr. anthony fauci hitting back at republican attacks over his handling of covid in his first public testimony since leaving the government in 2022. we go inside the tense hearing room. >> reporter: tonight dr. anthony fauci in the hot seat. >> you belong in prison. >> i am so sorry that you are subjected to those level of attacks. >> reporter: house republicans pressing the former face of america's pandemic response on past covid restrictions, including that rule americans should stay six feet apart. >> wearing a mask, maintaining six feet of distance -- >> reporter: fauci told the committee behind closed doors that six-foot rule sort of just appeared. today clarifying he meant there were no clinical trials done. >> do you think that a role that sort of just appeared is substantial justification for the regulations that we saw based on that six-foot rule? >> when saying it just appeared, it came from the cdc. >> you didn't feel an obligation as the lead scientist at the nih to challenge that? >> i've challenged the cdc multiple times. >> publicly you challenged them on the six-foot distance rule -- >> it is not appropriate to be publicly challenging -- >> reporter: republicans pressing him on covid's origins. fauci downplaying the possibility of a leak from a lab in wuhan, china. >> do you agree there was a push to downplay the lab leak theory? >> not on my part. >> really? >> really. >> wow. >> wow. >> i think most of the country would find that amazing. >> look at the facts. i've kept an open mind throughout the entire process. >> reporter: fauci emotional talking about the threats he and his family still face. >> it is very troublesome to me, it is much more troublesome because they've involved my wife and my three daughters. >> reporter: that hearing underscoring time hasn't healed those political wounds. meanwhile, former new york governor andrew cuomo set to testify next week. lester? >> thank you. to the middle east now. israel confirming today the deaths of four more hostages in hamas captivity. it comes as president biden turns up the pressure on israel and hamas to accept a cease-fire deal saying it must get done. raf sanchez on in tel aviv. >> reporter: tonight israeli prime minister benjamin netanyahu saying president biden last week gave an incomplete description of an israeli offer for a cease-fire in gaza. >> it's time for this war to end. >> reporter: netanyahu under pressure from israel's far right saying it's incorrect, that israel agreed to a permanent cease-fire without the complete destruction of hamas and release of all hostages first. the white house pushing back, insisting the president fairly and honestly described the israeli proposal. and families of the hostages clamoring for an immediate deal. a call growing louder tonight after the israeli military confirmed the deaths of four more hostages in hamas captivity. today we met the parents of american hostage hersh goldberg polin. >> what is your message to the leaders of israel, to the leaders of hamas? >> i would beg the leaders to act like leaders, and part of being a leader is you put your people ahead of your own personal self-interest. >> reporter: while in gaza, the father of 10-year-old ahmed wipes his face and tries to keep the flies away. the little boy has cerebral palsy and needs surgery he can't get in the strip. little his family can do except pray for a cease-fire. pine tonight also demanding hamas accept the deal and write in "this deal must get done." >> thank you. in 60 seconds, the new warnings about alleged russian attempts to disrupt the summer olympics in paris. how security experts say it could happen right after this. simple. just type wt.com. weathertech has hundreds of premium products that will keep dad's vehicle looking its best. like laser-measured floorliners, cargo liner and seat protector for extra interior protection. sunshade blocks harmful uv rays. the cupfone perfectly secures his phone while driving. order these american made products or a gift card at wt.com. happy father's day. (♪♪ ) why did i keep missing out on this? before you were preventing migraine with qulipta? do you remember the pain, the worry, the canceled plans? and look at me now. you'll never truly forget migraine but qulipta reduces attacks making zero-migraine days possible. it's the only pill of its kind that blocks cgrp and is approved to prevent migraine of any frequency. to help give you that forget you get migraine feeling. don't take if allergic to qulipta. most common side effects are nausea, constipation and sleepiness. learn how abbvie could help you save. qulipta, the forget-you-get migraine medicine. less than two months before the start of the paris olympics troubling new reports tonight about russia's alleged attempts to disrupt the games with disinformation and cyberattacks. keir simmons is in paris and has the latest. >> reporter: tonight with paris gearing up for this summer's olympics, two reports warn of russian disinformation targeting the games, including fake videos aimed at spreading fear of violence and damaging the reputation of the olympics. produced a microsoft report says by prolific russian influence actors. this bogus documentary posted last summer titled "olympics has fallen," featured a deep fake tom cruise. while a second report by u.s. cyber experts recorded futures seen by nbc news says russia is the most likely primary state actor to target the olympics with a disruptive cyberattack. president putin furious with france for its support of president zelenskyy, and putin angry at the ioc for banning athletes from competing under the russian flag because of the war. >> the olympics is just a great target if you are russia. russia has a long-standing beef with the ioc over the expulsion of russian athletes for cheating. >> reporter: paris has invested billions to beef up security, facing challenges one of the reports says not seen since london, a 2012, from protests to cyberattacks. warning cyber criminals will be attracted to such high-profile events, and the chance to target the public with email phishing scams and suspicious links. >> these are things that we all should be aware of, and you know, hopefully we can all enjoy a fantastic paris games free from cyber threats. >> reporter: tomorrow here in paris experts including from the u.s. will gather for an annual cyber summit predicting a spectacular games and a wave of cyberattacks. lester? >> all right, thank you. up next, why some major artists are scaling back their summer concerts, and could it happen to you? the price you pay is next. made my life a lot harder. but the picture started changing when i started on vyvgart. ♪♪ vyvgart is for adults with generalized myasthenia gravis who are anti-achr antibody positive. in a clinical trial, vyvgart significantly improved most participants' ability to do daily activities when added to their current gmg treatment. ♪♪ most participants taking vyvgart also had less muscle weakness. and your vyvgart treatment schedule is designed just for you. in a clinical study, the most common side effects included urinary and respiratory tract infections, and headache. vyvgart may increase the risk of infection. tell your doctor if you have a history of infections or symptoms of an infection. vyvgart can cause allergic reactions. available as vyvgart for iv infusion and also as vyvgart hytrulo for subcutaneous injection. additional side effects for vyvgart hytrulo may include injection site reactions. talk to your neurologist about vyvgart. i'm a bee and i've bumbled my way into your car. buzz but this hive isn't big enough for the both of us. boo oh wow, what a buzzkill. and if you don't have the right auto insurance coverage, paying for this could really sting. so get allstate, save money, and be protected from mayhem... like me. 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