Health restrictions from possessing guns. Hiring more than 230 additional fbi employees to help process background checks. And a Budget Proposal for an additional 200 agents and investigators at the bureau of alcohol, tobacco firearms. Now, after meeting this afternoon with his attorney general, loretta lynch, the president said he was confident these changes are consistent with the second amendment, that theyre not an unconstitutional end run around congress, but, scott, one thing is all but certain these proposals and these executive actions are going to be challenged, whether in congress or in court. Just as the president s executive actions on immigration have been challenged in court. Jan crawford at the white house tonight. Jan, thank you very much. The president s shot was heard everywhere on the campaign trail today, and with less than four weeks to the first voting, candidates are turning to their own big guns. Major garrett is in New Hampshire tonight. Reporter scott, republican president ial candidates condemned the president s executive action as overreach even before the details were known. Not surprisingly, president obama received strong support from democrat Hillary Clinton, who today deployed one of her most potent political weapons. Bill clinton held his first Solo Campaign event of this election cycle, admitting the times feel a bit unsettling. I dont fit anymore. First of all, im a happy grandfather. Im not mad at anybody. Reporter clinton was in New Hampshire, a state where his affections run deep. The former president s second place finish here in 1992 paved the way to the nomination. Hillary clintons win in 2008 got her back into the race against barack obama. Unlike that campaign when bill clinton acted as his wifes co strategist and hyperactive endorser, today he brought a quieter pitch. I do not believe in my this job at a moment of greater importance who was Better Qualified by knowledge, experience and temperament to do what needs to be done now. To restore prosperity reporter clinton did not directly address Donald Trumps recent attempts to dredge up his 1990s sex scandals. Campaigning in iowa, Hillary Clinton said she had a trump inspired new years resolution. Im going to let him live in his alternative reality and im not going to respond. Reporter trump took on the democratic frontrunner in his First Television ad. The politicians can pretend its Something Else, but donald trump calls it radical islamic terrorism. Reporter the border images of migrants are not migrants crossing from mexico into the United States but crossing a border in morocco. The Trump Campaign said it used that video on purpose to show what would happen in america if illegal immigration is not stopped. Major garrett on the campaign. Now for some insight we turn to john dickerson, our cbs news political director and the anchor of face the nation. John, what do you make of that trump ad . Reporter well, its an ad about fear and walls, fear of mexicans crossing the border illegally. Trump started his campaign promising a wall to keep them out, and its about fear of islamic terrorists. Trump promises to keep them out by temporarily walling off muslims from entering america. Republican voters rank these emotional issues as top concerns and trump on these issues has a decided advantage over his opponents. The iowa caucus is february 1st, less than a month away. Where does the race stand . Reporter on the republican side the race is a battle between trump and everyone else. The alternative might be ted cruz or a mainstream candidate republicans like, someone like marco rubio or chris christie. On the democratic side, Bernie Sanders is the grassroots support is not split. Theres just Hillary Clinton, who is the stable frontrunner. With less than a month to go before the voting starts, campaigns are at the point where every decision they make about travel, about resources could have irrevocable consequences. John dickerson, well be watching sunday on face the nation. Thanks, john. Thanks, scott. Tonight, Law Enforcement is not moving to retake a government building at a National Wildlife refuge in oregon. The building was seized two days ago by armed protesters, another flareup in the generationslong showdown between ranchers and the largest landlord in the west, uncle sam. John blackstone is there. Reporter at the entrance to the wildlife refuge headquarters, ammon bundy declared this a fight hes determined to win. And it is left to us to decide whether we allow these things to go on or whether we make a stand so they will not this country. Reporter the occupation began saturday after a demonstration in support of local ranchers dwight and steven hammond. They were convicted for arson after a fire on their ranch spread on to federal land. They arrived at a prison in Southern California today to begin a fiveyear sentence. So you want the federal government to give up this wildlife refuge, give it back to ranchers . Is that the demand . I want the federal government to abide by the constitution of the United States. Get out of here, you cowards reporter in 2014, bundys father cliven battled government officials over grazing rights on federal land in nevada. That escalated into an armed confrontation. So far in oregon there has been no confrontation. Not a single Law Enforcement officer to be seen for miles around the occupied refuge. Here inside the compound there is plenty of heavy equipment, but we dont see any evidence of heavy defenses or even weapons by the occupiers. Frankly, we dont see many while there is no evidence of broad local support for the occupation, in this wideopen country, independence is highly valued. The county sheriff did have a message for the occupiers today. He said if theyre here to help the people of this county, its time for them to go home. John blackstone reporting tonight. John, thank you. The cbs overnight news will be right back. Almost sixty million americans are affected by mental illness. Together we can help them with three simple words. My name is chris noth and i will listen. From maine to maui, thousands of High School Students across the country are getting in on the action by volunteering in their communities. Chris young action teams of High School Students are joining volunteers of america and Major League Baseball players to help train and inspire the next generation of volunteers. Carlos pea its easy to start an action team at your school if you were a hippie in the 60s, you need to know. Its the dawning of the age of aquarius. Yeah, and Something Else thats cool. What . Osteoporosis is preventable. All osteos preventable . Right on if you dig your bones, protect them. All cbs cares theres more extreme weather in the forecast. With arctic air blasting the northeast, rain and snow in the west, and in the midwest, the historic winter flood is rolling on. At least 25 people have been killed there. Theres no peace in olive branch, illinois, where we find David Begnaud tonight. David . Reporter scott, at least half of the town of olive branch, illinois, is underwater there are flooded homes like the one behind me for miles in areas that are known to be vulnerable to major flooding. Theres the breech. Reporter in alexander county, illinois, the flooding is disastrous, and the temperature is near freezing. Its gotten real bad here. Reporter today the u. S. Coast guard flew us over the spot where the 18mile levee failed about 72 hours ago. This is where the levee breeched sending water from the Mississippi River into a flood plain. At least 100 structures are flooded, 14,000 acres of the county are under water, and the water is rising. Reporter this is the home of Brandon Dillow and jennifer korte. They built their levee eight feet high. Tonight theyre dry. They learned a lesson during a flood in 2011. Then the levee was five feet high and water got inside the home. Depressing. It changes your whole life. Reporter many like them have been asked to evacuate but david bighams elderly parents got out, but the others stayed behind to save what was left. You worry about everything you got and everything youre going to lose. Reporter from the air you see the home is surrounded by water on three sides. Bigham has 25,000 sandbags and eight water pumps working to keep the property dry. So far theyre holding. Reporter back near the levee breach, we spotted this herd of deer, victims of the unrelenting flood running for an escape. We noticed tonight the water seems to have dropped about an inch in the last six hours. Thats great news for the bigham family. Friends and family are working around the clock, dead set on saving this house that has been here since 1959. Scott, some of this floodwater could reach memphis by friday. David, thank you very much. Ben tracy is reporting much of this crazy weather is being driven by the warming pacific reporter el nio has already hit californias mountains. The latest snowpack survey found five feet of snow in the sierras, a welcome sight after four years of drought. Southern california is now bracing for a series of storms. Josh rubenstein is a meteorologist at kcbs in los angeles. Were looking at about an inch to two inches of rain in the l. A. Basin, and right on its heels, heres that third system thats moving in on wednesday. The rain from that could linger all the way into friday. Reporter el nio is an intense warming of the Pacific Ocean near the equator that changes weather patterns around the world. This is one of the largest on record. In glendora, california, eric erby was stocking up on sandbags. It could happen any time anywhere. It depends on how much. Either way, ill make sure im prepared. Reporter los angeles is designed to prevent flooding, which is why the Los Angeles River is encased in all of this it may look like a pathetic little stream tonight, but, scott, later this week you could have ten to 20 feet of water filling this channel. Ben tracy, thanks. Well, it was a wave of worry that swept world Financial Markets today after stocks in china plunged. The dow was down as much as 467 points, but it recovered, ending with a loss of 276 or 1. 6 . It is the worst start to a year since the great recession. The markets were also rattled by saudi arabia and iran. The two are rivals because the saudis represent the sunni branch of islam and iran is home to the shiite branch. Over the weekend, the saudis executed a shiite cleric. After a furious iranian reaction, countries in the gulf are choosing sides. Heres holly williams. Reporter in iran today, angry protesters denounced saudi muslim cleric nimr alnimr. His death has opened a 1,400 yearold wound, enflaming tensions between sunni and shiite muslims. In the sunniled kingdom of saudi arabia, alnimr dared to demand equality for shiites and was shot and then arrested in 2012. It was in shiitedominated iran that Saudi Arabias Embassy was ransacked and burned on saturday. Around 40 people were later arrested, but iran made its feelings clear by renaming this street in honor of the executed cleric. Saudi arabia and iran are already fighting two deadly proxy wars against each other in syria and yemen, taking sides along religious lines. Now there are fears that al nimrs execution will fuel even east. Shiite muslims also clashed with police in bahrain. They used tear gas and rubber bullets against the protesters. Blaming iran for the escalation, saudi arabia has severed diplomatic ties with tehran. Its ally, bahrain, has followed suit, while the United Arab Emirates has recalled its ambassador. With many countries in the middle east already torn apart by religious differences, these tensions could destabilize the region even more, especially, scott, if saudi arabia and iran try to use those religious divisions to further their own interests. Holly williams reporting for us tonight in istanbul. Holly, thank you. Is man creating earthquakes in oklahoma . And theyve discovered the wreck of el faro, the worst u. S. Maritime disaster in 30 years. The cbs overnight news will be right back. So how ya doing . Enough pressure in here for ya . Yeah. Just wait til we hit ten thousand feet. Im gonna take Mucinex Sinusmax. Too late, were about to take off. These dissolve fast. Theyre new liquid gels. And youre coming with me. Wait, what . you realize i have gold status . Do i still get the miles . New Mucinex Sinusmax liquid gels. Dissolves fast to unleash max strength medicine. Start the relief. Ditch the misery. Your heart loves omega3s. But theres a difference between the omega3s in fish oil and those in megared krill oil. Unlike fish oil, megared is easily absorbed by your body. Which makes your heart, well, megahappy. Happier still, megared is proven to increase omega3 levels in 30 days. Megared. After a swarm of small earthquakes in oklahoma, the state has ordered oil drillers today to reduce the amount of wastewater they inject into the ground during a process known as fracking. Heres mark strassmann. Reporter oklahoma, not earthquake capital. Who do you call if you feel an earthquake . Reporter until 2008, the state averaged one or two a year. Now its almost three a day. It was a big boom. And everything started shaking. Reporter including you . Including me. Reporter a 4. 5 magnitude earthquake hit crescent, oklahoma, last july. Grocery clerk Lois Gillette hugged a coworker. I thought i was going to fall. There was a lot of stuff fell off the shelves. Reporter oklahoma keeps breaking records for earthquakes with a magnitude of 3. 0 or higher. More than 900 last year alone. But why . Most geologists connect the spike in earthquakes to the states oil and gas industry and its disposal of massive amounts of water into underground caverns. Geologist todd halihan teaches at oklahoma state. Unfortunately there is a side seismicity due to the injection wells, theyre startling when you feel them, and there are now a lot of people experiencing them on a pretty broad scale. Reporter Lois Gillette isnt taking sides. I dont know if its manmade. I dont have any idea. Reporter you would just like it to stop . I want it to stop. Please. Reporter one geologist we talked to said no question something has reactivated fault lines here, fault lines that had been dormant for 300 million years. And well be right back. Today the National Transportation safety board said that it may press for more evidence in the sinking of the american cargo ship el faro, lost this past october in hurricane joaquin. All 33 crew were killed. Recently on assignment with 60 minutes, we sailed with the ntsbs investigator, tom rothroffy as el faro was discovered 15,000 feet under the atlantic. This is where el faro came to rest, upright, hull largely intact, her name mangled on the stern. Her depth markings reported that this, the bow, had sunk 15 feet her autopsy revealed a body that had been savagely beaten, steel crushed, equipment collapsed. There was no sign of the 33 crew equipment and cargo litter the seabed. Thats a microwave oven, and on the right, thats a printer. Here is the top of a car with a sunroof, part of the cargo. At the top of that white line there is the most surprising part of our video surveys. Theres nothing above there. What should be there . There should be two decks above that. The lower navigation bridge deck and the bridge deck. The two top decks had sheered off, including the bridge, where captain davidson would have been fighting the storm. They were nowhere near the ship. Also missing, the voyage data recorder, like a socalled black the safety board says it may search again for that data recorder, which would have captured conversations on the bridge. Our final story coming up next. Woman what does it feel like when a woman is having a heart attack . Chest pain, like theres a ton of weight on your chest. Severe shortness of breath. Unexplained nausea. Cold sweats. Theres an unusual tiredness and fatigue. Theres unfamiliar dizziness or lightheadedness. Unusual pain in your back, neck, jaw, one or both arms, even your upper stomach, are signs youre having a heart attack. Dont make excuses. Make the call to 911 immediately. Learn more at womenshealth. Gov heartattack. While i was on a combat patrol in baqubah, iraq, a rocketpropelled grenade took my arm off at the shoulder. I was discharged from the army, and ive been working with warriors, you dont have to be severely wounded to be with the Wounded Warrior project. We do have a lot of guys that have posttraumatic stress disorder. Being able to share your story, i guess it kind of helps you wrap your mind around what did happen over there. My name is norbie, and yes, i do suffer from posttraumatic stress disorder, the government says we need 75 minutes of vigorous exercise a week. Dr. Jon lapook has one way to get it. Reporter this is considered vigorous . Right. Reporter Carol Ewing Garber teaches the science of exercise at columbias teachers college. How many calories a minute do you burn procrastinating . Because im really good at that. Many at all. Reporter for those who get tired just thinking about strenuous exercise without rest, theres a fitness approach called high intensity interval training or h. I. T. Short bursts of high intensity exertion, say a minute or two of running as fast as you can, followed by a short period of recovery, maybe a slow jog for a few minutes. So ill row for 100 meters. So thats a short row. It will be high intensity. Im going to try to bring the power up. Reporter h. I. T. Is the mantra at orange theory fitness where eddie diaz is a coach. This will be a Recovery Period here. Get those nice deep breaths in, and after youre done