Elon Musk has told Justin Trudeau he “doesn’t matter” after the outgoing Canadian prime minister dismissed Donald Trump’s plan for the U.S. to take over its northern neighbor. The key adviser to the president-elect jabbed Trudeau on his X social media platform (formerly Twitter) after Canada’s premier announced Monday he is to resign.

On Monday, Prime Minister Justin Trudeau stepped down as the country and party leader, marking the end of a decade in power. (That’s a long time, but it’s still short of his dad’s 15 cumulative years in office.