Even after President Donald Trump ordered emergency pay for Transportation Security Administration agents to ease long security lines, major U.S. airports on Sunday were still urging travelers to arrive hours early — and federal immigration officers brought in to help may not be leaving anytime soon.

Trump’s executive order on Friday instructed the Department of Homeland Security to pay TSA officers immediately, though it’s unclear how quickly travelers will see an impact. The move comes during a busy travel stretch, with spring breaks underway and Passover and Easter approaching.

Tens of thousands of TSA employees have been working without pay since DHS funding lapsed on Valentine’s Day. The department’s shutdown reached 44 days on Sunday, eclipsing the record 43-day shutdown last fall that affected all of the federal government.

Trump deployed Immigration and Customs Enforcement agents to some airports a week ago to help with security as TSA callouts rose nationwide — the same officers who may now remain in place if TSA staffing strains continue.

Making the rounds on Sunday morning news shows, White House border czar Tom Homan said the end of ICE’s deployment at airports depends on how many TSA employees would be returning to work after they start receiving their pay.

“ICE is there to help our brothers and sisters in TSA. We’ll be there as long as they need us, until they get back to normal operations and feel like those airports are secure,” he told CBS’ “Face the Nation.”

Speaking on CNN’s “State of the Union,” Homan said it also depends on how many TSA agents “have actually quit and have no plan on coming back to work.” Nearly 500 TSA officers have left the agency since the shutdown started, according to DHS.