CNN — There are two things to remember when assessing Donald Trump’s presidencies. First, nothing is more important than the commander in chief looking tough. Second, nothing is really what it seems. Trump’s classic political method is already on full display in his second presidency and helps explain the baffling chaos, brinkmanship and posturing of his tariff showdown with Canada and Mexico. Punishing 25% levies on imports from America’s closest neighbors were due to come into force at 12:01 a.m. ET Tuesday, but Trump put his two-front trade war on hold, claiming he’d scored two big wins and major concessions….