From cutting off energy shipments to imposing export tariffs, a reality check on the potential options for responding to Trump

The Prime Minister and Canada’s premiers left a meeting Wednesday promising to come up with “retaliatory measures” to respond to U.S. president-elect Donald Trump’s threatened tariffs, but they have yet to say what exactly those actions would include.Canada has a number of options, but almost all of them could do further damage to the country’s economy or national unity, legal and trade experts warn – and some would likely have little effect on the U.S.