President Donald Trump, angered by statements made at a news conference by Canadian Prime Minister Justin Trudeau after Trump left the G7 Conference, said he was withdrawing his endorsement of a joint communique issued by conference participants and may look to slap tariffs on automobile imports he claimed were “flooding the US market.”

The effort to show a united front by the G7 was shattered and a new trade war threatened after Trudeau spoke of retaliatory measures that Canada would take next month. The comments were made in response to the US tariffs on steel and aluminum imports from Canada, Mexico, and the European Union.

“Canadians, we’re polite, we’re reasonable, but we also will not be pushed around,” said Trudeau, who hosted the two-day summit in La Malbaie, Quebec

Trump issued two tweet condemning Trudeau’s comments.

Trudeau’s office responded to Trump’s tweets with a statement. “We are focused on everything we accomplished here at the summit. The Prime Minister said nothing he hasn’t said before – both in public, and in private conversations with the President.”