President-elect Donald Trump on Monday pledged big tariffs on the United States' three largest trading partners - Canada, Mexico and China. Trump, who takes office on Jan. 20, said he would impose a 25% tariff on imports from Canada and Mexico until they clamped down on drugs and migrants crossing the border. For analysis on the potential economic and political impacts, we speak with Inu Manak, a fellow for trade policy at the Council on Foreign Relations (CFR).