Canada's former leader Chrétien has blunt advice for Trump: 'Give your head a shake!'

Jean Chrétien, who was Canada’s prime minister from 1993 to 2003, joined a chorus of officials from the northern U.S. neighbor who say Trump's remarks are no longer a joke and may undermine America’s closest ally. Canada would never agree to become part of the United States, Chrétien wrote in an article published in The Globe and Mail newspaper, celebrating his 91st birthday.