WASHINGTON (AP) — President Donald Trump on Saturday threatened to impose a 100% tariff on goods imported from Canada if America’s northern neighbor went ahead with its China trade deal, intensifying a feud with Prime Minister Mark Carney, a rising voice in the West’s pushback to Trump new world order.

Trump said in a social media post that if Carney “thinks he is going to make Canada a ‘Drop Off Port’ for China to send goods and products into the United States, he is sorely mistaken.”

While Trump has waged a trade war over the past year, Canada this month negotiated a deal to lower tariffs on Chinese electric vehicles in return for lower import taxes on Canadian farm products.

Trump initially had said that agreement was what Carney “should be doing and it’s a good thing for him to sign a trade deal.”

Carney’s office did not immediately respond to a request for comment.

Trump’s threat came amid an escalating war of words with Carney as the Republican president’s push to acquire Greenland strained the NATO alliance. Trump had commented while in Davos, Switzerland, this week that “Canada lives because of the United States.” Carney shot back that his nation can be an example that the world does not have to bend toward autocratic tendencies. “Canada doesn’t live because of the United States. Canada thrives because we are Canadian,” he said.

Trump later revoked his invitation to Carney to join the president’s “Board of Peace” that he is forming to try to resolve global conflicts.

Trump’s push to acquire Greenland has come after he has repeatedly needled Canada over its sovereignty and suggested it also be absorbed the United States as a 51st state. He posted an altered image on social media this week showing a map of the United States that included Canada, Venezuela, Greenland and Cuba as part of its territory.

In his message Saturday, Trump continued his provocations by calling Canada’s leader “Governor Carney.” Trump had used the same nickname for Carney’s predecessor, Justin Trudeau, and his first use of it toward Carney was the latest mark of their soured relationship.

Daniel Béland, a political science professor at McGill University in Montreal, said “there was a sense Trump showed more respect for Carney than for Trudeau. Now, after Carney’s visit to China and, even more, his widely celebrated Davos speech, which clearly outshined and upset Trump, the gloves are off.”

Carney has emerged as a leader of a movement for countries to find ways to link up and counter the U.S. under Trump. Speaking in Davos before Trump, Carney said, “Middle powers must act together because if you are not at the table, you are on the menu” and he warned about coercion by great powers — without mentioning Trump’s name. The prime minister received widespread praise and attention for his remarks, upstaging Trump at the World Economic Forum.