The Navy briefed three senators Wednesday on a number of reported encounters with unidentified aircraft amid growing requests from members of oversight committees.

The office of Sen. Mark Warner Mark Robert WarnerFBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits MORE (D-Va.), the vice chairman of the Senate Intelligence Committee, confirmed the meeting to The Hill.

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“If pilots at Oceana or elsewhere are reporting flight hazards that interfere with training or put them at risk, then Senator Warner wants answers. It doesn’t matter if it’s weather balloons, little green men, or something else entirely — we can’t ask our pilots to put their lives at risk unnecessarily,” his spokeswoman, Rachel Cohen, said in a statement.

The Navy did not immediately respond to requests for comment from The Hill.

Interest surrounding “unidentified aerial phenomenon” has spiked since 2017 after it was revealed that former Senate Majority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.) requested the Pentagon set up a program to study the issue. Officials reportedly interviewed several current and former sailors and aviators who say they’ve encountered advanced aircraft that defied the laws of aerodynamics. Videos of the aircraft intruding on protected military airspace have also been published.

Politico first reported in April that the Navy updated its procedures for pilots and other personnel to report such sightings.

“In response to requests for information from Congressional members and staff, Navy officials have provided a series of briefings by senior Naval Intelligence officials as well as aviators who reported hazards to aviation safety,” the Navy said in a statement to Politico at the time.

The Senate briefing comes days after President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE said he had been briefed on reports of the sightings.

“I did have one very brief meeting on it,” he told ABC News. “But people are saying they’re seeing UFOs. Do I believe it? Not particularly.”

Despite the president’s skepticism, officials told Politico that more briefings could be in the pipeline.

“There are people coming out of the woodwork,” said one former government official who has participated in some of the meetings.

“More requests for briefings are coming in,” a current intelligence official added.