What to know about Trump's calls to make Canada the '51st state'

(The Hill) -- President-elect Donald Trump has doubled down on his suggestion of a merged United States and Canada following Canadian Prime Minister Justin Trudeau’s decision to resign.Some have shrugged off Trump’s suggestion that Canada should “become the 51st state” as an old joke or mere posturing, while others dismiss it as a bad political idea given Canada’s blue leanings. But Trump on Tuesday threatened “economic force” to