Here's a quick rundown about why Michigan is so vulnerable to the tariffs Trump ordered Tuesday on Canada and Mexico (and China).

Jose Guadalupe Jaimes dropped off his son at a middle school in Trenton, his children said. Moments later, the immigrant father driving a work van was approached by three vehicles with their lights flashing.

Automotive remains the most important sector in the state, which has more vehicle manufacturing jobs than anywhere else in the country. More than 9% of Michigan's gross domestic product is tied to auto — higher than any other state, according to the Alliance for Automotive Innovation.

Ontario Premier Doug Ford said that his province is prepared to add a 25% surcharge on the electricity it exports to Michigan.