President Donald Trump has repeatedly said Canada should be the 51st U.S. state, erasing the 5,525-mile border the nations share and alleviating the need for tariffs he’s threatened against one of America’s top allies.

President Donald Trump repeated his push to economically push Canada into becoming the 51st state during is press conference announce 25% tariffs.

President Trump said Thursday that Canada is a “serious contender” to become the 51st state, alleging that America’s neighbor to the north needs US “protection.” Trump, 78, has repeatedly floated the idea of Canada joining the Union — even mockingly referring to outgoing Prime Minister Justin Trudeau as “governor” — and revisited the topic while signing a memorandum ordering reciprocal tariffs on countries around the world.