Donald Trump is again warning Canada about automobile tariffs and NAFTA.

The U.S. President Tweeted that Canada’s “tariffs and trade barriers are too high.  Will tax cars if we can’t make a deal.

While Canada sits on the NAFTA renegotiation sidelines, the U.S. and Mexico continue their bilateral talks.  Trump Tweeted that Canada “must wait,”

Canada has not been at the bargaining table with the other two countries all summer, causing concern that it might have no choice but to accept a deal reached between the U.S. and Mexico.