Prime Minister Mark Carney won the Canadian election vowing to take on President Trump. Tuesday, they meet for the first time in the Oval Office.

The Trump administration's "Make America Healthy Again" platform has boosted the agenda of a conservative think tank that's been working for more than a decade to reshape the nation's public ...

The Posse Comitatus Act restricts using federal troops in civilian law enforcement. Exceptions exist, but Trump's crackdown on immigration is shaping up to be a major test for the law.