President Donald Trump signed an executive order Wednesday to bar undocumented migrants from accessing public benefits, even though they’re already denied most federally funded programs—his latest move to tamp down on illegal immigration, though it wasn’t immediately clear which initiatives would be impacted.

Caleb Vitello, a veteran ICE official who was installed as acting director when Trump took office, will be reassigned.

The Department of Homeland Security said ICE “needs a culture of accountability that it has been starved of for the past four years.”