Since U.S. President Donald Trump first threatened to place massive tariffs on Canadian goods, the country has been embroiled in a whirlwind back and forth with its biggest trading partner. Here's a quick look at how tariffs are set under normal circumstances.

It’s the latest in a number of auto industry maneuvers by Trump during his first weeks back in the White House. Auto companies are also navigating the reversal of fuel economy standards, dialed down greenhouse gas emission standards and a host of electric vehicle policy rollbacks.