Washington, D.C — President Donald Trump announced a military deployment in the U.S-Mexican border to ensure security.

More than 5,200 troops will be sent to the border to assist the local and federal law enforcement and border security authorities with an imminent influx of immigrants from Central America. The administration’s decision comes after stories broke last week regarding the migrant caravan. The caravan, which has reportedly exceeded 10,000 people, is headed toward the U.S. border. The president said that the caravan contains numerous gang members and “some very bad people.” He added in a tweet that they “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!”

Some deployed troops are part of the active duty force. More than 2,000 National Guard soldiers have already been mobilized to deal with the crisis. Last week, an average of around 1,900 immigrants either illegally entered the country or requested asylum. It is unclear how many managed to enter unnoticed.

“The president has made it clear that border security is national security,” said Gen. Terrence O’Shaughnessy, the head of U.S. Northern Command. Although O’Shaughnessy mentioned that the soldiers will be armed, other U.S. officials have emphasized that the deployed troops will be there to support and directly intervene. More specifically, they stressed that troops would build infrastructure — such as barricades, tents, and chow halls — that would enable customs officers to safely handle immigrants.