Mark Carney has been elected leader of Canada’s Liberal Party, official results confirmed Sunday, making him the next prime minister, succeeding Justin Trudeau.

Carney assumes leadership during a difficult period, with Canada facing trade tensions with the U.S. under President Trump and an upcoming general election.

Carney, 59, took 86% of votes cast to beat former Finance Minister Chrystia Freeland in a contest in which just under 152,000 party members voted.

“There’s someone who’s trying to weaken our economy,” Carney said of Trump, spurring loud boos at the party gathering. “He’s attacking Canadian workers, families, and businesses. We can’t let him succeed.”

“This won’t be business as usual,” Carney said. “We will have to do things that we haven’t imagined before, at speeds we didn’t think possible.”

In January, Trudeau announced that he would step down after more than nine years in power as his approval rating plummeted, forcing the ruling Liberal Party to run a quick contest to replace him.

“Make no mistake, this is a nation-defining moment. Democracy is not a given. Freedom is not a given. Even Canada is not a given,” Trudeau said.

Carney, who has no previous political experience, argued that he was best positioned to revive the party and to handle trade negotiations with Trump, who is threatening additional tariffs that could seriously harm Canada’s export-dependent economy.

Notably, Trudeau has imposed C$30 billion of retaliatory tariffs on the United States in response to tariffs Trump levied on Canada.