After Trump's tariff announcement, will the U.S. end up in a trade war?

President Trump announced Thursday that he will put tariffs on imported aluminum and steel. On Friday, he tweeted, “trade wars are good, and easy to win.” Reaction to this unexpected move has been swift. The stock market is taking a dive. Our big trading partners -- the European Union, Canada, China -- are crying foul and warning they might retaliate. But some union workers and their supporters say it’s about time they get help with overseas competition.