The White House is arguing that former aide Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE is “absolutely immune” from being compelled by Congress to testify about her time working in the Trump administration, in an effort to limit her closed-door interview Wednesday.

White House counsel Pat Cipollone sent a letter to House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) on the eve of Hicks’s scheduled closed-door testimony, notifying the top Democrat that 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 had instructed Hicks not to answer the panel’s questions about her time working in the White House.

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“Ms. Hicks is absolutely immune from being compelled to testify before Congress with respect to matters occurring during her service as a senior adviser to the President,” Cipollone wrote Tuesday.

“Because of this constitutional immunity, and in order to protect the prerogatives of the Office of the President, the President has directed Ms. Hicks not to answer questions before the Committee relating to the time of her service as a senior adviser to the President,” he wrote.

The committee, which is pursuing a sweeping investigation into alleged abuses of power by Trump, reached a deal with Hicks to submit to a closed-door interview on Wednesday pursuant to a subpoena.

Democrats are eager to question Hicks, the former White House communications director and ex-Trump campaign aide, about the campaign’s activities and the episodes of potential obstruction of justice by Trump that are detailed in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s report. Hicks was interviewed by Mueller, and her testimony is cited frequently in Mueller’s report.

The White House’s efforts to limit her testimony are likely to infuriate Democrats who have accused Trump and his administration of going to unprecedented lengths to stonewall their investigations and oversight requests.

Hicks will be accompanied by at least one White House lawyer, who is expected to raise any objections to questioning on Wednesday.

Cipollone’s letter cites various Office of Legal Counsel opinions in arguing that Hicks is immune from compelled testimony about her work in the White House, including the one issued by the Justice Department in May that Trump cited when instructing former White House counsel Don McGahn not to testify before the committee pursuant to a subpoena.

Cipollone also indicated that the White House may try to block Hicks from answering questions about her time on the presidential transition team because of potential executive privilege concerns.

“Much of Ms. Hicks’s work during this period involved discussions with the President-elect and his staff relating to the decisions the President-elect would be making once he assumed office,” Cipollone wrote.

“Accordingly, her responses to specific questions about this period would likely implicate executive branch confidentiality interests concerning that decisionmaking process,” he wrote. “In order to preserve the President’s ability to assert executive privilege over such information, a member of my office will attend Ms. Hicks’s testimony on June 19.”

A Judiciary aide said Tuesday that the committee wants the White House to record any specific assertions of executive privilege during Hicks’s interview on Wednesday. The White House has thus far stopped short of making a formal assertion of privilege to prevent former officials from testifying before Congress.

“The proper procedure is if you have an executive privilege to assert, or any other, you’ve got to put it on the record,” the committee aide said. “We’re expecting and we’re going to press them to put it on the record and if it’s not put on the record, we’re not going to accept that as being satisfactory with respect to the subpoena.”

If Democrats are unsatisfied with Hicks’s testimony on Wednesday, they could go to court to enforce the subpoena for her testimony and documents.

The White House earlier this month instructed Hicks to not comply with the committee’s demands for documents related to her time working in the administration. Hicks has provided some records related to her work on the Trump campaign.