President Trump has threatened to send the U.S. military to the southern border with Mexico to stop an incoming group of migrants from entering the United States.
A caravan of more than three thousand migrants from El Salvador, Honduras and Guatemala are heading north on foot to escape violence and poverty.
Trump made the threat in a series of tweets on Thursday, adding he may even close the border all together.
He also threatened to cut all aid payments to the three countries over illegal immigration - threats he has made before.
The U.S. is pressuring Mexico to control the caravan and Secretary of State Mike Pompeo is due to meet with Mexican President Enrique Pena Nieto in Mexico City on Friday.