The Department of Justice must investigate funding behind the massive migrant caravan heading to the U.S. border, and the people traveling from Guatemala, Honduras, and El Salvador won't be able to make a legitimate asylum claim once they arrive, Rep. Louie Gohmert said Monday.

"We have got to have the DOJ investigate where the funding is coming from to send these thousands and thousands of people to the U.S., because that you can use RICO to go after them," the Texas Republican told Fox News' "America's Newsroom." "Asylum claims are not legitimate if they are not made in the, if we're not the first country they come to after leaving their country."

He added that there were "supposedly" political factors that got the caravan started, and then it took on an "inertia on its own."

"There is money coming in," he said. "I'm sure there is some coming from the United States going to help this caravan along. It is building of its own momentum and it will take a very strong president, which we have, to stop it and we've got to make clear to Mexico they are not coming in."

He added that President Donald Trump will take care of the issue, which he has called an invasion.

"Under our constitution a governor can call out military troops to stop an invasion, but fortunately Gov. (Greg) Abbott won't have to because the president will take care of that," said Gohmert.