U.S. President Donald Trump on Wednesday blasted Canada over the slow pace of NAFTA talks, saying he was so unhappy that he had rejected Canadian Prime Minister Justin Trudeau's request for a one-on-one meeting.

The remarks by Trump, who repeated a threat to impose tariffs on Canadian autos, knocked the Canadian dollar down to a one-week low against the U.S. greenback.

The comments also mark a new low in relations between the two leaders. Trudeau spokeswoman Chantal Gagnon said: "No meeting was requested. We don't have any comment beyond that."