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.

By suspending Parliament and promising to resign, the prime minister bought the Liberals time. But Canada will now face Donald J. Trump with a lame duck in charge.

Announcing his resignation on Monday, Trudeau said he planned to stay on as prime minister until a new party leader is selected. Who will succeed him — and can they survive a looming no-confidence vote?