In a confirmation hearing on Thursday, Trump's U.S. trade representative nominee Jamieson Greer said other countries will need to reduce barriers to U.S. exports if they want to maintain access to the U.S. market, citing Vietnam in particular.

"I'll be announcing that next week—reciprocal trade—so that we're treated evenly with other countries," Trump said. "We don't want any more, any less."

U.S. President Donald Trump's ability to swiftly impose, and then delay, tariffs on top trading partners has left world markets swinging one way and then another. Last weekend, for example, he announced sweeping tariffs on Canada,

Thursday’s hearing wasn’t a sign of congressional action — it was a political weather vane, showing which way the politics is blowing. And the message to Trump’s pick for trade representative was: Don't apply big tariffs on Canada.