George Conway, the husband of top White House aide Kellyanne Conway, has taken Donald Trump to task with a fact-check of the president’s false claims about illegal border crossings.

Trump tweeted Tuesday morning, ahead of his State of the Union address, that “tremendous numbers of people are coming up through Mexico in the hopes of flooding our Southern Border.”

“We will build a Human Wall if necessary,” he added. “If we had a real Wall, this would be a non-event!”

Conway hit back at his wife’s boss with figures released by the U.S. Customs and Border Protection agency: