National Guard troops have hit the streets in Washington, D.C., and are now patrolling at President Trump's direction.

Here is where Trump has chosen to deploy federal troops during his two terms. During Trump’s first term, he deployed the National Guard to the U.S.-Mexico border in a bid to cut down on illegal immigration. Trump’s first term, much like his second, was defined by his aggressive immigration tactics.

A federal judge will hold a three-day trial to determine whether Trump's deployment of troops in California violated the 1878 Posse Comitatus Act.