A war of words has erupted between the U.S. and Canada as President Donald Trump and his top advisers launched their harshest criticism against Canadian Prime Minister Justin Trudeau. In a series of tweets on Saturday, Trump slammed Trudeau for acting "very dishonest & weak" at the Quebec meeting and announced that the U.S. will not sign the G7 traditional joint communique. Footage Credit: Reuters, Fox News Sunday, CNNMusic Credit: Audioblocks 'Dramatic Thriller'