Trump's tariffs: What are they? How do they work?

WASHINGTON — President Donald Trump has once again turned to tariffs to try to get his way with a U.S. trading partner.

This time, the target is Mexico: Trump plans to impose 5% tariffs on Mexican imports starting June 10 and to ratchet them up to 25% by Oct. 1 if the Mexicans don't do more to stop the surge of Central American migrants across the southern U.S. border.

http://www.startribune.com/trump-s-tariffs-what-are-they-how-do-they-work/510726382/