Justin Trudeau has been Canada’s prime minister since November 2015, longer than any other leader of a major western democracy. But a series of political fumbles — including the scathing resignation of his finance minister,

The "Trump factor" was a key element driving Trudeau's resignation, Chantal Da Silva said at NBC News. Incoming U.S. president Donald Trump has threatened to slap large tariffs on America's northern neighbor — and has frequently mused about making Canada America's "51st state.

Justin Trudeau, who has led the country for nearly a decade, is giving up leadership of the Liberal party. He said he would remain in both roles until his replacement had been chosen through a party election.