President-elect Donald Trump's proposed 25% tariff on goods from Mexico and Canada would harm relations between the United States and Mexico and Canada, President Joe Biden told reporters on Thursday.

Trump said in a post to Truth Social on Monday that one of his first executive orders would be to hit Mexico and Canada with a blanket 25% tariff. Mexico and Canada are the second and third top suppliers of goods to the U.S., according to the Office of the U.S. Trade Representative. The U.S. imports the most goods from China.

Joe Biden has warned that Donald Trump could “screw up” American and Mexican relations with his tariff threat.