President Donald Trump said Sunday that Americans could feel some pain from the emerging trade war triggered by his tariffs against Canada, Mexico and China, and claimed that Canada would cease to exist without its trade surplus with the United States. The trade penalties that Trump signed Saturday at his Florida resort caused a mix of panic, anger and uncertainty, and threatened to rupture a decades-old partnership on trade in North America while further straining relations with China. But by following through on a campaign pledge, Trump may have simultaneously broken his promise to voters in last year's election that his administration could quickly reduce inflation. WILL THERE BE SOME PAIN? YES, MAYBE (AND MAYBE NOT!), Trump said in a social media post. BUT WE WILL MAKE AMERICA GREAT AGAIN, AND IT WILL ALL BE WORTH THE PRICE THAT MUST BE PAID. His administration has not said how high that price could be or what improvements would need to be seen in stopping illegal immigration a