Hours after being sworn in, President Trump fulfilled his campaign promises to crackdown on illegal immigration. The President declared an emergency at the southern border, and as a result, there have already been many changes to policy.

In recent remarks to the press, President Donald Trump restated his intention to impose 25% tariffs on U.S. imports from Mexico and Canada as early as Feb. 1. His reasoning: "vast" illegal immigration and "massive" amounts of fentanyl coming to the U.

Immigration since President Donald Trump's inauguration has been a hot topic. Here's what has happened, and what you need to know.