Damian Paletta Joel Achenbach The Washington Post

President Donald Trump left America's closest allies dismayed Sunday after he yanked the U.S. endorsement of a Group of Seven economic agreement and then unleashed a Twitter attack - echoed by further harsh criticisms from his White House advisers - on Canadian Prime Minister Justin Trudeau.

President Donald Trump left America's closest allies dismayed Sunday after he yanked the U.S. endorsement of a Group of Seven economic agreement and then unleashed a Twitter attack - echoed by further harsh criticisms from his White House advisers - on Canadian Prime Minister Justin Trudeau.