President trump fired the first round in what may become a trade war with americas secondbiggest trading partner. The Commerce Department proposed a 20 tax on canadian lumber. Its one of canadas biggest exports, and it goes into a lot of american homes. The Trump Administration says that government subsidies make canadian lumber artificially cheap. A trade war could be costly, because the u. S. Sells as much to canada as it buys. Just ask American Dairy farmers. Dean reynolds did. Reporter gina hinchlys wisconsin farm has 130,000 cows, producing 1,000 gallons of milk every day. Hers is one of the 9,000 dairy billion to wisconsins economy. And this spring, theres been a gusher of american milk. Weve had more milk from the same amount of cows than ever before. Reporter but thats a problem. And according to the president , our neighbors to the north are making it worse. Canada, what theyve done to our dairy farm workers is a disgrace. Its a disgrace. Reporter canadas decision to lower prices on certain kinds of Dairy Products has undermined American Dairy and boosted Canadian Farmers whose product is now cheaper. For years, American Farmers exported their Dairy Products to canada taxfree and were counting on exporting their recordhigh commodity to their usual canadian customers, but now theyre stuck. I think were afraid. We have a surplus of milk, so a lot of us farmers are worried. What is the future for us . Reporter grassland, a big Dairy Processor here has lost last year and 75 family farms have shuttered or are in trouble. Wisconsin farms like john lists. Hes called dozens of other processors for help. It was just no, too much milk, too much milk, too much milk. Reporter this morning, the president tweeted we will not stand for this. The Dairy Farmers are hoping hes just not crying over spilled milk. First daughter ivanka trump went to germany for a meeting of business women and government. Reporter ivanka trump had come to a highpowered conference in berlin to champion the cause of working women. But she came with baggage, her fathers baggage. Hes been a tremendous champion of supporting families. Reporter at that, some from the microphone began to groan. I need to address one more point. Reporter mind the audiences skepticism, the moderator asked, stem toward the attitude donald trump had to women in the past, seeming to go to the video about groping women. I certainly heard the criticism from the media. And thats been perpetuated, but i know from personal experience. Reporter President Trump had also championed womens rights, his daughter said. German chancellor Angela Merkle had welcomed ivanka trump here. At least, says joseph braumle, that was the plan. I think that was a smart move by our chancellor. She made it clear, we want to have contact and maybe if radical man, so be it. Reporter ivanka trump later downplayed the incident, saying politics is politics. But scott, the first daughters first foray onto the International Stage had its rough moments. Mark phillips at the brand brandenburg gate. President trump is strengthening the area around the Korean Peninsula. We spoke with mark hill. Hill is the dean of the university of denvers joseph corvill school. In terms of american lives is north korea a threat or an irritant . Its a threat. Its a threat. First of all, we have some 28,000, 38,000 americans in south korea, but we have to understand, this is an agreement we have. We are dutybound, treatybound to come to south koreas defense. Should the North Koreans attack. If we have to go in there, we would be in the middle of the fight. So you bet. Its a threat to our lives. You led the american envoy negotiating. What do you know about his father . His father seemed to care what we thought. And what distinguishes his son, he doesnt seem to care what any of us think, and hes certainly not been interested in any, any phase of negotiation. Is he sane . Sane from the point of view of running that country, of making sure that hes consolidated power, making sure that everyone works for him, yeah, yeah. We know that the North Koreans have been successful in building missiles and successful in detonating nuclear tests. The real trick is putting those two things together. What are the chances that the North Koreans are close . You know, very hard to say. But the feeling is that within the next four years , they coul have a Missile System with a Nuclear Warhead that would be credible. Whether it would finally work when they pushed the button, hard to say, but it would be credible. And any president would have to consider that as a real threat. Former ambassador chris hill. Coming up, keep your eyes on the road and hands on the wheel. Now, theres an app for that. Later, as the water grows, drivers bailed. [car engine failing to start] [wind blows] yo wh ah he [gas pouring] [slurps loudly] [engine starting] [loud slurping continues] uh, the soy sauce . Its gone. Treat your clothes better with new tide pods plus downy. Its got to be tide ialmost everything. You know, ke 1 i n 10 houses could get hit by an expensive septic disaster. But for only 7 a month, avoid a septic disaster with ridx. It says you apply the blue one ok, letto me. This. Here . No. Have a little fun together, or a lot. Ky yours and mine. Two sensations that work together, so you can play together. Smartphones, cars and teenagers, a dangerous combination. But now theres a Smartphone App that could save lives. Heres kris van cleave. Would you say youre a good driver . As g could be, i guess. Reporter sarah gregorys been driving for about a year. Her parents asked her to download an app that tracks and scores her performance every time shes behind the wheel. Its almost like having mom or dad in the car to remind you. Knowing its in the background, it helps me drive a lot better. If im speeding, ill look down, and ill be like, my app will take off for that. Reporter sarahs parents cliff and julie also use the ever drive app. We can tell when they use their phone or didnt use their phone. We can detell if they were exceeding the speed limit. Reporter can these devices make me as an adult a better driver. They have the poe tones tento that. Reporter she runs the National Safety council. What we have to do is get to a point comfortable getting that feedback and modifying their driving behavior. Reporter the technology is a growing business from apps to devices like verizon hum. If she drives like this, you can tell her to drive more like this. Reporter buick has now maid smart Driver Technology standard in most vehicles. We have 1 million customers enrolled in smart driver today. Reporter the smart drover system not only helps driving but can save you money. You can opt in to seek an opportunity to get an insurance discount. And were seeing that the customers are receiving a 30 discount on their insurance. Reporter the apps essentially try to make safe driving into a game and you get a score and are compared to other drivers. Buick believes they can increase safety using this technology coupled with things like Collision Avoidance and lane departure avoidance. Next, nascars most driver nears his final lap. Ok honey you play with your monkey while i get your little brother cleaned up. Daughter uh oh. Monkey swimming. Irreplaceable monkey protection. Detergent alone doesnt kill bacteria, but adding new lysol laundry sanitizer kills 99. 9 of bacteria with 0 bleach. Daughter uh oh. Lysol. What it takes to protect. Because your carpet theres resolve carpet care. With five times more benefits than vacuuming alone. It lifts more dirt, pet hair and removes odours. While softening every fibre because your carpet never stops working, resolve carpet care with five times benefits new eedegrra ultclearnt saving black white. Othes. No yellow stains on white clothes. No white marks on black clothes. New degree ultraclear black white. It wont let you down. Under water. One driver had to abandon ship when her car was submerged. A cemetery flooded and at least one casket floated to the surface. Dale earnhardt jr. Says he will retire in november. The son of a legend, earnhardt won the most popular driver award 14 times and has 26 cup victories. Now 42 and he recently married, hes faced many concussions. Up next, a lost version of cbs news. Discover the storyy onl your dna can tell. If itus usually because you were driving too fast or you didnt look before you turned or you didnt stop for someone in the crosswalk. Always be alert. Pedestrians dont come with airbags. Finally tonight, we turn back the clock, 50 years to april 1967, and one of the more unusual chapters in television history. The cbs evening news, with arnold zinker, substituting for Walter Cronkite during the strike. Yes, Walter Cronkite was on strike. The Union Representing tv personalities was on a walkout. John daley and others were off the air and on the street. Newscasters were replaced by management. But who would subf for cronkite . An a to z search led to arnold zinker, a 28yearold cbs executive who had worked his way through school doing radio broadcasts. I said ive never done television. They said youre going to do the cbs morning news, then they said stay around and do the midday news. And with about an hour of experience under his belt, he was called in to fill in for cronkite. Planes have been using a massive bomb. He got more than 3,000 fan letters. Its the standard case of the understudy. The star goes out for whatever reason, and an understudy nobodys ever heard of sits in, sits in the chair, gets good reviews. Anchor was born. I do think they almost felt, he hit the lottery, maybe i could hit the lottery some day. On the 13th day, the strike was settled. After weeks at the pinnacle of network had a great future ahead of him. Thats when i decided to go to boston and do the news. Bitten by the anchor bug, he tried his hand at local tv, and years later he returned to cbs briefly in a 60 minutes cameo, in his new career, training executives to master the public spotlight. He travels the country, preaching the gospel according to zism nker. Now a half century after zinker made headlines, he is a footnote. Tv trivia for 100. Arnold zenker replaced this newsman. This has been the cbs evening news with Arnold Zenker substituting for Walter Cronkite. Thats the orn for this wednesday. For some of you the news continues, for others, check back later for cbs morning news and cbs this morning. From the Broadcast Center in new york city, im scott pelley. This is the cbs overnight news. Im don dahler. President trump has summoned all members of the senate today. Tensions are rising in asia. The north is expected to conduct another nuclear test. An armada is south of the Korean Peninsula. And trump is being asked to show restraint. Adriana diaz has the story from beijing. Reporter President Trump is also ramping up his war of words. Monday he said kim jong un is not a strong militarily as he International Community for not doing more to rein him in. The status quo in north koreas also unacceptable. Reporter at the white house on monday, President Trump scolded members of the u. N. Security council for falling short in their dealings with north korea. The council must be prepared to impose additional and stronger sanctions. Reporter in a show of force, intended to send a warning to north korea, the Uss Carl Vinson Strike Group along with two japanese destroyers are rapidly approaching the Korean Peninsula. There theyll be joined by south korean ships. The uss michigan, a nuclearpowered submarine also arrived in the port city of pusan today. Angered by the buildup and threat of further sanctions, the regime has stepped up its rhetoric, unveiling new weapons while lashing out at its adversaries. North korean media called the movement extremely dangerous, saying carefully any catastrophic consequence. This raises the stakes. Reporter analyst Jonathan Polak says the white house needs to proceed cautiously. With the United States and others talking far too loose lay of the prospects of a preemptive strike, thats what would trigger retaliatory actions by north korea. Reporter its also been three days since tony kim was detained at north koreas airport. We could stumble needlessly into what would be the biggest crisis in east asia since the United States intervened in the korean war in 1950. Reporter to avoid that, President Trump is working closely with china. Hes already spoken with chinas president twice in the past two weeks. First daughter and white house adviser, ivanka trump continues her visit to germany. Shes taking part in an international womans summit. But it wasnt all smilend handshakes. Ivanka actually got booed by the audience when she described her father as quote a tremendous champion of supporting families. Mark phillips is in berlin. Reporter this is no ordinary visit by an ordinary white house official. This is three visits in one by ivanka trump the first daughter, the president ial adviser and the businesswoman. Its complicated, like the state of u. S. german relations right now. On the face of it, ivanka trump has come to berlin for a highpowered conference on promoting the role of working women. Its one of her pet issues. But shes also here because Angela Merkel knows an opportunity when she sees one. When the german chancellor went to washington to meet ivankas father, the atmosphere bordered on icy. So when Angela Merkel met ivank Women Conference it was more than playing to the first daughters interests. Political analysts say it was a way to use a side door to get into the white house. You take what you get. Reporter and what do you think you get with her . You get access to donald trump and maybe a moderating effect to donald trump, because hes also surrounded by people who are less moderate and seem to be more radical. Reporter ivanka, the special adviser to the president , did tell gayle king that when it comes to trying to influence her father on issues that she cares about, shes not shy. This particular title was about giving critics the comfort that im holding myself to the highest ethical standard. But ill weigh in with my father on, on the issues i feel strongly about. Reporter but this visit isnt about issues. Its about trying to jump start a stalled relationship. We actually d ivanka trumps position is on the issues of contention between washington and berlin right now. Russia, nato refugees. We do know that the Trump Administration has yet to appoint its own ambassador to germany, so that right now go terms of highlevel diplomacy, ivanka trump is it. A lot of your favorite tv shows could be in reruns this fall. The Writers Guild has voted to authorize a strike, and that could be bad news for hollywood. Shows like the Roseanne Barr show, the Gilligans Island show were shot right here in this studio. Sound stages like this have never been busier. 455 of them were built just this season compared to, thats more tan about six years ago, more than double than about six years ago that is. Right now, wrietders are saying were seeing more content coming from hulu and netflix and they want hollywood to pay for the new late night talk shows. Injected pieces of golf balls, let them play through. Reporter but all those jokes come from Union Writers who could soon be putting their pens down and putting the shows in jeopardy. More than 6300 of this members voted by a margin of 96 to authorize a march on the picket lines if a deal isnt reached with the Producers Union before the current contract expires on may 1st. The fall lineup could also take a hate. I skipped kindergarten. Reporter tv writer betty carr has worked on shows like private practice. The writers are paid per episode. A traditional broadcast series runs2224 episodes, but now shows on cable or average of just 12 episodes. The shows are often shot to look more like a movie, taking longer in production, which keeps writers tied up for the same amount of time while making less money. The average income for writers has gone down, 23 . Its about not being able to sustain yourself. Reporter wrietders are asking for higher script fees. Bigger residuals from streaming media and larger contributions to their health plans. When unionized writers went on strike ten years ago, it lasted more than three months, halting production on tozs of tv shows and films. It also cost the industry at least 2 billion. In a Statement Released monday night, the Producers Alliance said they remain committed to reaching a deal but warned the 2007 Writers Strike hurt everyone. Writers lost more than it 287 million in compensation that was never recovered. Hopefullyt at. It will be hard, it will be scary if thats what we have to do. The cbs overnight news will be right back. 1 i n 10 houses could get hit by rything. You an expensive septic disaster. But for only 7 a month, ridx helps break down waste. Avoid a septic disaster with ridx. Ltry align probiotic. N your digestive system . For