TORONTO (AP) — Canadian Prime Minister Justin Trudeau’s chances of staying on in power have become more tenuous after the opposition party that backed his government for years announced it will vote no confidence in the government when Parliament resumes.

An embattled Trudeau reshuffled his Cabinet on Friday — but whether he will step aside in the coming days or weeks remains an open question.

Trudeau participated in the swearing-in ceremony and will chair a meeting with his new Cabinet later Friday. He is not expected to speak publicly Friday as he mulls his future.

“The prime minister has simply asked for some time to reflect on his own future,” said David McGuinty, the new Public Safety Minister. “He deserves to have that time to think about what he wants to do.”

Rachel Bendayan, the official languages minister, said Trudeau “told us he had a difficult choice to make.”

Trudeau is facing rising discontent over his leadership, and the abrupt departure of his finance minister on Monday could be something he can’t recover from.

Parliament is now shut for the holidays until late next month, but the leftist New Democratic Party said Friday it would trigger a vote of no confidence in Trudeau after lawmakers reconvene on Jan. 27.

Because Trudeau’s Liberals do not hold an outright majority in Parliament, they have for years depended on the support of the NDP to pass legislation and stay in power. But that support has vanished — NDP leader Jagmeet Singh has called on Trudeau to resign — and he made clear Friday the NDP will vote to bring down the government.

“No matter who is leading the Liberal Party, this government’s time is up. We will put forward a clear motion of non-confidence in the next sitting of the House of Commons,” Singh said in letter released just before the Cabinet shuffle.

The Liberals could delay Parliament’s return. Trudeau could decide not to run in the next year’s election and allow for a party leadership race.

New Finance Minister Dominic LeBlanc said Thursday that Trudeau has the “full support of his Cabinet” but acknowledged a rising number of Liberal members of Parliament want Trudeau to leave.

Liberal Rob Oliphant became the latest lawmaker to call for the prime minister to step aside, saying there should be a “robust, open leadership contest.”

Trudeau, who has led the country for nearly a decade, has become widely unpopular in recent years over a wide range of issues, including the high cost of living and rising inflation.

The political upheaval comes at a difficult moment for Canada.

President-elect Donald Trump has threatened to impose 25% tariffs on all Canadian goods if the government does not stem what he calls a flow of migrants and drugs in the United States — even though far fewer of each cross into the U.S. from Canada than from Mexico, which Trump has also threatened.

Canada’s Transport Minister Anita Anand, who on Friday added the role of minister of internal trade to her portfolio, said it won’t be good if the Liberal government is not united as it deals with Trump’s threats.

There is no mechanism for Trudeau’s party to force him out in the short term. He could say he will step aside when a new party leader is chosen, or his Liberal party could be forced from power by a “no confidence” vote in Parliament that would trigger an election that would very likely favor the opposing Conservative Party.

“It’s clear the prime minister has lost control,” Conservative leader Pierre Poilievre said.