President Trump in an interview published Tuesday said his administration is thinking “very seriously” about designating Mexican drug cartels as foreign terrorist organizations.

“We are. We are,” Trump told Breitbart News. “We’re thinking about doing it very seriously. In fact, we’ve been thinking about it for a long time. . . . As terrorists — as terrorist organizations, the answer is yes. They are.”

His comments come in the wake of his declaration of a national emergency at the U.S.-Mexico border last month, a move designed to spend more money on border barriers than authorized by Congress.

Read more: The Washington Post