White House press secretary Karoline Leavitt warned against a growing threat of legal and illegal immigrants who have not assimilated into the United States and are subsequently draining the nation’s resources in the aftermath of the shooting of two National Guard members one day before Thanksgiving.

“The Trump administration has done more to limit migration, both illegal and legal, than any administration in history, and I’ll just walk you through some of the actions that we have taken thus far,” Leavitt said during a Monday press briefing defending President Donald Trump‘s efforts to crack down on immigrants.