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.

Canadian Prime Minister Justin Trudeau resigns, saying he cannot 'be the leader during the next elections due to internal battles.'

The leadership change comes at a challenging time for Canada, with domestic and international pressures mounting.