Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) is warning top intelligence community officials that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE could expose a whistleblower at the center of the House impeachment inquiry.

Schumer sent a letter to acting Director of National Intelligence Joseph Maguire Joseph MaguireCongressional Democrats request FBI briefing on foreign election interference efforts Wells Fargo told employees to delete TikTok from work phones Hillicon Valley: Pompeo floats TikTok ban | Civil rights groups slam Facebook after call | Election security funding included in proposal MORE and Inspector General Michael Atkinson on Monday saying he's "concerned" Trump might disclose the individual's identity and wants to know what steps are being taken to protect the person.

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"In light of the President’s ill-advised statements, his lack of respect for the rule of law and his well-documented habit of condoning violence by his supporters, I am concerned that he may disclose the whistleblower’s identity or cause it to be disclosed by others in the Administration," Schumer wrote in the letter.

Trump and his allies have repeatedly lashed out at the whistleblower, who filed a complaint tied to Trump pushing the Ukraine government to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son and the administration's decision to delay aid to the country.

Schumer's letter, which was first reported by Politico, comes shortly after Trump used a Cabinet meeting to double down on his demand that the whistleblower be publicly identified.

"I think they want to impeach me because it's the only way they're going to win. ... They've got nothing. All they have is a phone call that is perfect. All they have is a whistleblower who's disappeared. Where is he?" Trump asked.

Trump has also called the whistleblower a "fraud," and argued he has the right to confront the individual.

Schumer added in his letter that if the whistleblower's identity is disclosed, Maguire and Atkinson have the responsibility to protect the person from retaliation.

"I understand that some security measures may already have been put in place, but I fear that safety risks may intensify in the event that the whistleblower’s identity is disclosed. I also note reports that one or more additional whistleblowers may come forward, creating added security concern," Schumer wrote.

"I therefore ask that you inform me regarding your plans to ensure that these whistleblowers are adequately protected," he added.

House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) said earlier this month that testimony from the intelligence community whistleblower may no longer be necessary since the White House released a partial transcript of the call in question.

"Given that we already have the call record, we don't need the whistleblower who wasn't on the call to tell us what took place during the call," he told Margaret Brennan during an interview on CBS's "Face the Nation."