CHRISTINE ROMANS, CNN CHIEF BUSINESS CORRESPONDENT: On the EU, Mexico, Canada. The three had temporary exemptions but the White House let those waivers expire after it didn't get what it wanted from these negotiations. The president calls this fair trade. The goal, to help U.S. steel workers. But metal tariffs could raise prices for consumers. It also puts the U.S. in another trade dispute just at the very moment it targets $50 billion in Chinese goods for tariffs. The three U.S. allies quickly struck back. Mexico threatens tariffs now on farm produce, think apples, pork, cheese. The EU targeting classic American goods, blue jeans, motorcycles, bourbon. Canadian plans to tax U.S. steel and aluminum an equal amount. The Canadian prime minister, Justin Trudeau, calls the U.S. tariffs an affront and says they won't hurt just Canada, but U.S. workers as well. The Chamber of Commerce says Trump trade move risks 2.6 million American jobs, especially if NAFTA falls apart. That's the worst case scenario. "The Wall Street Journal" editorial board slamming Trump's needless trade war for hurting the economy, his foreign policy and perhaps Republicans in November. And Republicans are fuming. Senator Ben Sasse says it's dumb to treat allies the way you treat opponents. Speaker Paul Ryan says the U.S. should be working with allies on fair trade practices, not targeting them. But, John, this is the president putting America first.</s>JOHN BERMAN, CNN ANCHOR: Yes, it's a real split in the Republican Party. It will be interesting to see how much Congress pushes back and what they're willing to do. Christine Romans, thanks very much. The power to pardon. President Trump using it and raising big questions about why. Is he sending a signal to witnesses in the Mueller probe and those being investigated?
U.S. Hits Allies with Tariffs