President Trump said Monday that "tent cities" will be set up to provide shelter for migrants seeking asylum.

"We're going to put tents up all over the place," Trump said on Fox News. "We're not going to build structures and spend ... hundreds of millions of dollars. We're going to have tents, they're going to be very nice and they're going to wait and if they don't get asylum, they get out."

A caravan of migrants is headed to the U.S.-Mexico border from Central America, becoming a hot topic for the Right ahead of the 2018 midterm elections.

On the same day his administration announced Monday 5,200 soldiers will be sent to the Southern border before the caravan arrives, Trump said the migrants are "wasting their time” and will not be allowed into the the U.S.

"When they are captured, we don't let them out," Trump said in an interview with Fox News’ Laura Ingraham on Monday. "We're not letting them out ... We're not catching, we're not releasing ... We're not letting them into this country."

Earlier in the day, Trump urged the group to head back to their home country and that the U.S. military is “waiting” for them.

"Many Gang Members and some very bad people are mixed into the Caravan heading to our Southern Border," Trump tweeted Monday. "Please go back, you will not be admitted into the United States unless you go through the legal process. This is an invasion of our Country and our Military is waiting for you!"

Officials have said the troops won't be involved in U.S. immigration law, but rather will assist with engineering projects, constructing temporary barriers, and fencing. Additionally, they are planning to help transport Border Patrol personnel and assist medical teams.