The dollar partially rebounded on Tuesday after sliding the day before as President Donald Trump suggested the U.S. could impose tariffs on Canada and Mexico by Feb. 1, challenging suggestions his trade policy may be more gradual.

Trump in response to a reporter’s question said the administration was considering imposing tariffs of 25% on imports from Mexico and Canada as soon as Feb. 1. The moves, if implemented, would kickstart a long-expected trade war between the three countries.

The president said he planned to put tariffs on America’s neighbors on Feb. 1, as he signed an executive order mandating a sweeping review of U.S. trade policy.