Homeland Security adviser Stephen Miller said on Monday that “people who don’t belong here” are responsible for the United States’ growing national debt.

During an executive order signing to address supposed fraud within federal programs, Miller attributed the debt to undocumented immigrants who received Medicaid benefits and emergency care at hospitals.

“What we found since President Trump came into office is that the Democrats have set up the system to funnel hundreds of billions, and ultimately trillions of dollars, to migrants,” Miller said.

He claimed U.S. Immigration and Customs Enforcement agents had asked a group of detained migrants whether or not they were on Medicaid, and “half of them raised their hands and volunteered that they were on Medicaid.”

Miller added that the undocumented immigrants in that group who said they didn’t receive Medicaid benefits still went to hospitals because “they get free care there, and they bill it to the taxpayers.”