Canada’s left-wing New Democratic Party (NDP) on Wednesday announced it was withdrawing from the coalition keeping Prime Minister Justin Trudeau in power, a blow that could seriously threaten the already-embattled Trudeau’s grip on power. NDP leader Jagmeet Singh announced the breakup in a campaign-style video released by his party. “Today, I have notified the prime minister that I have ripped up the supply-and-confidence agreement. Big corporations and wealthy CEOs have had their government. It’s the people’s time,” Singh said in the video. A supply-and-confidence agreement is essentially a promise by a minority party to unconditionally support a larger party, without...