Trump administration updates: Schumer continues to face calls for new leadership

The Federal Aviation Administration is reinstating 132 FAA employees represented by the Professional Aviation Safety Specialists who were terminated as part of the mass layoffs across federal agencies, according to the union.

Those being reinstated include aeronautical information specialists who evaluated and prepared navigation maps, routes, charts, procedures and flight paths -- such as helicopter routes around Reagan National Airport and introduction of drones, the union said.

Reagan National was the site of a midair collision between a regional jetliner and an Army helicopter last month that killed all 67 people on the two aircraft.

Others returning to work include maintenance mechanics responsible for servicing air traffic control facilities, as well as environmental protection specialists and aviation safety assistants.

Employees will return to work March 20 and will receive back pay from February 15. the union said.

ABC News has reached out to the FAA and Department of Transportation for comment on the reinstatement.

-ABC News' Ayesha Ali

Probationary IRS workers on Monday received emails reinstating them at the agency but placing them on administrative leave in light of the court order, according to notices reviewed by ABC News.

"While you are being reinstated to federal service, you are also being placed on Administrative Leave," the note read. "You should not report to duty or perform any work until receiving further guidance."

--ABC News' Benjamin Siegel

White House press secretary Karoline Leavitt defended the administration's defiance of a judge's order to turn around two flights containing hundreds of alleged Venezuelan gang members as she was peppered with questions during Monday's briefing.

"What do you say to Americans who want safe streets but are concerned due process is being violated?" one reporter asked.

"The president is using every lever of his executive authority and his constitutional authority within the bounds of the immigration laws of our country to ensure that our streets are safer for law-abiding American citizens," Leavitt responded.

When pressed for more details about the individuals deported and how they were determined for removal, Leavitt said that ICE and CBP were "sure about the identities of the individuals who were on these planes and the threat that they posed to our homeland."

On ignoring the judge's order over the weekend, Leavitt contended that the flights had already departed by the time the written ruling was handed down at 7:26 p.m. When asked about the judge's verbal order, which was given earlier than the written ruling, Leavitt repeated her statement and questioned the validity of verbal orders.

UFC superstar Conor McGregor is at the White House to meet with President Donald Trump on St. Patrick's Day.

McGregor appeared in the briefing room with press secretary Karoline Leavitt and took some questions from reporters.

"Ireland is at the cusp of potentially losing its Irishness," he said as he railed against the Irish government's handling of immigration and other issues.

Trump expressed his admiration for McGregor when he met with Ireland's Taoiseach Michael Martin last week. When asked who his favorite Irish person was, Trump responded: "I do happen to like your fighter ... Conor's great."

McGregor is a controversial figure who's faced several misconduct allegations throughout his career. Last fall, a civil jury in Ireland found him liable of sexual assault. McGregor had denied the accusations.