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 by guarding exit lanes or checking passenger IDs unless Democrats agreed to fund the Department of Homeland Security. Democrats are demanding major changes to federal immigration operations and showing no sign of backing down.

Hundreds of thousands of homeland security workersincluding 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 MullinR-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.

Border czar heads up airport security effort

White House border czar Tom Homan, named by Trump to lead the new airport security effort, 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 agreement.”

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.

At the airport on Sunday, some travelers waited in line for nearly six hours at the main security checkpoint, where only two TSA agents were on hand midafternoon to check IDs. Many missed their flights and scrambled to book later flights or add themselves to standby lists that were already dozens of names long.

Dickens said all federal personnel would report to TSA and be assigned tasks such as line management and crowd control. “Federal officials have indicated that this deployment is not intended to conduct immigration enforcement activities,” his statement said.

Homan said immigration officers, as an example, could cover exits currently monitored by TSA agents, freeing them to work screening 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 also acknowledging 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. 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.”

But Everett Kelley, president of the American Federation of Government Employees, which represents more than 50,000 TSA employees, condemned Trump’s plan, saying in a statement that ICE agents are not trained or certified in aviation security.

“Our members at TSA have been showing up every day, without a paycheck, because they believe in the mission of keeping the flying public safe,” Kelley said Sunday. “They deserve to be paid, not replaced by untrained, armed agents who have shown how dangerous they can be.”

Budget talks stall as airport worries worsen

Democrats have said they are willing to fund TSA and most other parts of DHS as they press for changes to immigration operations after the deaths of two U.S. citizens at the hands of federal agents in Minneapolis during an immigration enforcement operation. ICE officers are largely being paid during the partial shutdown, thanks to an influx of cash from Trump’s big tax breaks bill last year.

“There are lots of ideas swirling right now,” said Senate Majority Leader John Thune, R-S.D. “The good news in all that is people realizing this has to get fixed, it has to get solved.”

As budget talks stayed behind closed doors Sunday, senators said they had few details of which airports or how many immigration officers were being dispatched. Some welcomed the effort.

“I don’t think it can hurt,” said Sen. Mike Rounds, R-S.D. “They can help relieve some of the pressure.”

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 airport, lines wrapped from one end of the airport to the other.

The scene appeared more chaotic at John F. Kennedy International Airport in New York. Large 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 d on’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.”

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

Associated Press writers Collin Binkley in West Palm Beach, Fla., Anthony Izaguirre in Lindenhurst, N.Y., Yuki Iwamura in New York, Nicholas Riccardi in Denver, Kate Brumback in Atlanta, Margery Beck in Omaha, Neb. and Rebecca Santana in Washington contributed to this report.

WEST PALM BEACH, Fla. (AP) — At war with Iran, President Donald Trump is cycling through an increasingly desperate list of options as he searches for a solution to the crisis in the Strait of Hormuz. He has jumped from calls to secure the waterway through diplomatic means to lifting sanctions and now escalating to a direct threat against civilian infrastructure in the Islamic Republic.

Trump and his allies insist they were always prepared for Iran to block the strait, yet the Republican president’s erratic strategy has fueled criticism that he is grasping for answers after going to war without a clear exit plan. On Saturday came his latest attempt, via an ultimatum to Iran: Open the strait within 48 hours or the United States will “obliterate” the country’s power plants.

Trump’s aides defended the threat as a hard-edged tactic to press Iran into submission. Opponents framed it as the failure of a president who miscalculated what it would take to get out of a geopolitical mire.

“Trump has no plan to reopen the Strait of Hormuz, so he is threatening to attack Iran’s civil power plants,” said Sen. Ed Markey, D-Mass, adding: “This would be a war crime.”

“He’s lost control of the war and he is panicking,” said Sen. Chris Murphy, D-Conn., responding to Trump’s post.

Over the course of about a week, Trump has repeatedly shifted his approach on the crucial waterway for global oil and gas transport. There is growing urgency for Trump as soaring oil prices rattle global markets and pinch American consumers months before pivotal midterm elections.

Trump and diplomacy

Trump tried his hand at a diplomatic solution last weekend when he called for a new international coalition to send warships to the strait.

Allies turned him down. Trump then said the U.S. could manage on its own. On Friday he suggested other countries would have to take over as the U.S. eyes an exit. Hours later he indicated the waterway would somehow “open itself.”

“You can’t all of a sudden walk away after you’ve kind of created the event and expect other people to pick it up,” Sen. Thom Tillis, R-N.C. told ABC’s “This Week.”

Trump’s Treasury Department on Friday made its latest attempt to get a handle on soaring gas prices, by lifting sanctions on some Iranian oil for the first time in decades. That relieved some of the pressure that Washington traditionally has used as leverage against Tehran.

The goal was to send millions more barrels of oil into the global market. It is not clear, however, how much of a dent that would make in lowering pump prices or how the administration could prevent Iran from cashing in on the renewed sales.

The administration earlier temporarily lifted sanctions on some Russian oil.

An ultimatum to Iran

Trump’s ultimatum, conveyed while he spent the weekend in Florida, carries a threat of remarkable aggression. His previous messaging mostly focused on U.S. success in hitting Iran’s air force, navy and missile production. This time, the threatened target is the energy infrastructure that powers hospitals, homes and more.

His social media post — 51 words, much of it in capital letters — did not have the appearance of a message that underwent the careful legal scrutiny needed to justify an attack on civilian infrastructure, said Geoffrey Corn, a law professor at Texas Tech University and a retired lieutenant colonel in the Army who served as a military lawyer.

“It certainly has a feeling of ready, fire, aim,” Corn said of Trump’s moving strategy.

“He overestimated his ability to control the events once he unleashed this torrent of violence.”

That type of widespread attack would probably be a war crime, Corn said. For military leaders, it could force a choice between obeying an order to carry out a war crime or refusing and facing criminal sanction for willful disobedience, he said.

Laws governing warfare do not explicitly forbid attacks on power plants, but the tactic is allowed only if an analysis finds that the military advantages outweigh the civilian harm, legal scholars say. It is seen as a high bar to clear because the rules of war are, at their core, designed to separate civilian and military targets.

Iran’s U.N. ambassador, in a letter to the Security Council, warned that the deliberate targeting of power plants would be inherently indiscriminate and a war crime, according to the state-run IRNA news agency.

The White House has already faced intense backlash after the U.S. was blamed for a missile strike on an Iranian elementary school that killed more than 165 people.

Trump aides justify latest attempt to rein in the crisis

Trump provided scant detail on which plants might be targeted and how. He gave Iran until Monday to reopen the strait or else the U.S. will strike “various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!”

Trump’s team came to his defense Sunday, offering justification for striking Iran’s energy grid.

Mike Waltz, the U.S. ambassador to the United Nations, said Iran’s Revolutionary Guard controls much of the country’s infrastructure and is using it to power the war effort. He said potential targets include “gas-fired thermal power plants and other types of plants.”

Speaking on Fox News, Waltz said he wanted to get ahead of “hand-wringing” from the global community, calling the Revolutionary Guard a terrorist organization. “The president is not messing around,” he said.

NATO’s secretary-general, Mark Rutte, who has allied himself closely to Trump, tried to calm tensions. He said he understood Trump’s anger and stressed that more than 20 countries are “coming together to implement his vision” of making the strait navigable as soon as possible.

Israel’s ambassador to Washington, Yechiel Leiter, cautioned against an all-out attack like the one Trump threatened. “We want to leave everything in the country intact, so that the people who come after this regime are going to be able to rebuild and reconstitute,” he told BLN’s ”State of the Union.”

Trump’s threat could prove counterproductive: If it’s carried out, Iranian leaders said they would completely close the strait and retaliate against U.S. and Israeli infrastructure.

___

Associated Press writer Seung Min Kim in Washington contributed to this report.