Wall Dispute ‘Politically Explosive’ for Mexico U.S. President Donald Trump’s controversial 20 percent tax on imports from Mexico to pay for a border wall would come as a second gift in less than a week for Canada’s oil patch. The tax, which White House press secretary Sean Spicer characterized as “theoretical,” would apply to countries “like Mexico,” with which the U.S. has a trade deficit, he said in a briefing Thursday. That would seemingly exempt Canada. The U.S. ran a surplus of $11.9 billion with the northern neighbor in 2015. This would potentially be a boon for Canadian oil sands producers whose heavy crude competes with Mexican supplies in the U.S. refining market. The proposed tax comes three days after President Trump revived the proposed TransCanada Corp.’s Keystone XL project to build a new crude pipeline from Western Canada to […]