U.S. President Donald Trump | Win McNamee/Getty Images Donald Trump: ‘Trade wars are good’ US president has imposed tariffs on steel and aluminum imports.

A day after deciding to impose tariffs on steel and aluminum imports, Trump doubled down today by saying that "trade wars are good, and easy to win."

Trump tweeted: "When a country (USA) is losing many billions of dollars on trade with virtually every country it does business with, trade wars are good, and easy to win. Example, when we are down $100 billion with a certain country and they get cute, don’t trade anymore — we win big. It’s easy!"

Trump's tweet came in response to near universal condemnation of Trump's decision to impose tariffs. "We will not sit idly while our industry is hit with unfair measures that put thousands of European jobs at risk,” said European Commission President Jean-Claude Juncker after Trump's announcement.

Canada also issued a warning to its southern neighbor. "Should restrictions be imposed on Canadian steel and aluminum products, Canada will take responsive measures to defend its trade interests and workers," said Foreign Minister Chrystia Freeland.