WASHINGTON (AP) — President Donald Trump’s decision to order federal immigration agents to U.S. airports to help with security during a budget impasse is drawing concerns that their presence may escalate tensions among air travelers frustrated over hourslong waits and screeners angry about missed paychecks.

Trump made clear on Sunday that he was going ahead with the plan to have immigration enforcement officers assist the Transportation Security Administration starting Monday by guarding exit lanes or checking passenger IDs unless Democrats agreed to fund the Department of Homeland Security.

Democrats have been demanding major changes to federal immigration operations, while the president issued a new threat Sunday night that he would reject deals with Democrats unless they agreed to a separate elections bill.

Hundreds of thousands of homeland security workers, including from the TSA, U.S. Secret Service and Coast Guard, have worked without pay since Congress failed to renew DHS funding last month.

“Bad idea,” said Sen. Lisa Murkowski, R-Alaska, about the new airport security plan, which Trump said would start Monday.

“What we need to do is, we need to get the DHS issues resolved, we need to get the TSA agents paid,” she told reporters at the Capitol, where the Senate held a rare weekend session. “Do you really want to have even additional tensions on top of what we are already facing?”

Senators advanced the nomination of Sen. Markwayne ullin, R-Okla., to be Trump’s next homeland security secretary by a largely party-line vote, 54-37, with two Democrats joining most Republicans. A vote on the confirmation could come as early as Monday. Mullin has tried to make the case that he would be a steady hand after the tumultuous tenure of Kristi Noem, Trump’s first DHS secretary.

White House border czar Tom Homan has also been meeting with a bipartisan group of senators over the partial shutdown. While he characterized those sessions as “good conversations,” he said they were “not at a point yet where we’re in total

greement.”

Meanwhile, Homan said in Sunday news show interviews that the increased role of U.S. Immigration and Customs Enforcement at airports — its specific duties and numbers — was subject to discussions with the leadership of TSA and ICE. DHS spokeswoman Lauren Bis said “hundreds” of ICE officers would be deployed, but she would not disclose the airports where they would go, citing security reasons.

“It’s a work in progress,” Homan said. The priority, he said, was “the large airports where there’s a long wait, like three hours.”

Atlanta Mayor Andre Dickens issued a statement Sunday night saying officers from ICE and Homeland Security Investigations would be deployed to the Hartsfield-Jackson Atlanta International Airport starting Monday morning.