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 the prime minister announced Monday he is to resign.

President-elect Donald Trump and Tesla CEO Elon Musk have celebrated the news that Justin Trudeau is stepping down as Canadian Prime Minister. Trudeau, who announced his resignation in a Monday morning press conference, has said he is planning to stay in his role as prime minister until a new leader is selected.