Canadian Prime Minister Justin Trudeau said Thursday he won’t be pressured by President Trump into agreeing to a renegotiated North American Free Trade Agreement. Trudeau’s comment came ahead of a Sunday deadline—set by President Trump—for Canada’s government to agree to a new version of NAFTA or face additional U.S. tariffs on automobile imports.

Prime Minister Justin Trudeau: “The Americans are finding that the negotiations are tough because Canadians are tough negotiators, as we should be. But a good and fair deal is still very possible. We won’t sign a bad deal for Canadians.”

Last month, the Trump administration and Mexico’s government reached a preliminary agreement to revise portions of NAFTA.