Trump made clear on Sunday, a day after saying he would use immigration officers for airport security starting Monday unless Democrats agreed on a bill to fund the Department of Homeland Security, that he was going ahead with the plan to assist the Transportation Security Administration.

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. Democrats are demanding major changes in the conduct of federal immigration agents and showing no sign of backing down.

White House border czar Tom Homan, named by Trump to lead this effort, has also been meeting with a bipartisan group of senators in recent days over the partial shutdown and while he characterized those sessions as “good conversations,” he said they were “not at a point yet where we’re in total agreement.”

The Senate, convening in a rare weekend session, was expected to advance the nomination of Sen. Markwayne Mullin, R-Okla., to be Trump’s next homeland security secretary. A vote on the confirmation could come as early as late Monday as Mullin has tried to make the casethat he would be a steady hand after the tumultuous tenure of Kristi Noem, Trump’s first DHS secretary.

Meantime, Homan said in Sunday news show interviews that the increased role of U.S. Customs and Immigrations Enforcement at airports — specific duties and numbers — was subject to discussions with the leadership of TSA and ICE “to find out where we can fit in.”

He pledged to have “a plan by the end of today, where we’re sending — what airports we’re starting with and where we’re sending them. … So it’s a work in progress.” The priority, Homan said, was “the large airports where there’s a long wait, like three hours.”

Immigration officers, as an example, could cover exits currently monitored by TSA agents, freeing them to work screening lines.

“ICE agents are assigned at many airports across the country already. They do a lot of investigation, criminal investigation on smuggling at airports,” Homan said, adding that “certainly, a highly trained ICE law enforcement officer can cover an exit and makes sure people don’t go through those exits, entering the airport through the exits. And stuff like that relieves that TSA officer to go to screening and to reduce those lines.”

Another option, he said, was having ICE agents check identification before people enter screenings areas.

“We’re going to be a force multiplier,” Homan said.

While saying to help “wherever we can provide extra security,” Homan said there were limits. “I don’t see an ICE agent looking at an X-ray machine, because we’re not trained in that,” he said.

Trump said in a social media post that on Monday, “ICE will be going to airports to help our wonderful TSA Agents who have stayed on the job” despite the partial government shutdown. He further criticized Democrats.

Travelers at some airports worried about reaching their gates Sunday.

At Atlanta’s Hartsfield-Jackson International Airport, lines wrapped from one end of the airport to the other.

“Everyone just seems to be accepting it for what it is, said 43-year-old Blake Wilbanks, who showed up 2 1/2 hours early for his morning flight to Salt Lake City after reading about the shutdown.

“Hopeful I’m gonna make it,” he said as he waited in a winding security line.

The scene appeared more chaotic at John F. Kennedy International Airport in New York. Large big crowds of anxious travelers piled toward security checkpoints, and TSA staff shouted through megaphones to tell people not to push one another.

For Transportation Secretary Sean Duffy, one concern is the uncertainty that passengers are facing over possible wait times at any airport on any given day.

“Do I have to come an hour and a half early? Do I have to come four hours early? They don’t know until the day of or the afternoon of their flight,” he said. “So if we can alleviate that, again, the president wants to take away that leverage point for Democrats and make travel easier for the American people.”

House Democratic leader Hakeem Jeffries of New York said “the last thing that the American people need are for untrained ICE agents to be deployed at airports all across the country” after criticism about their conduct as part of Trump’s immigration enforcement operations in Minnesota and elsewhere.

Homan appeared on CNN’s “State of the Union” and “Fox News Sunday,” while Duffy was interviewed on ABC’s “This Week” and Jeffries spoke on CNN.