President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's longtime assistant and senior vice president of the Trump Organization Rhona Graff is set to be interviewed by members of the House Intelligence Committee on Friday, according to NBC News.

While the committee's past interviews have been held at the Capitol in Washington by elected members of the committee, only a "handful" of lawmakers will take part in the interview at an unknown location in New York, according to NBC News.

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The report comes after Democratic lawmakers departed Washington on Thursday for the holidays.

House Democrats on the committee have expressed a growing concern in recent days about the direction of the probe under House Republicans.

The committee's ranking Democrat, Rep. Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (Calif.), has voiced his concerns that Republicans on the committee are looking to wrap up the probe early.

Schiff accused the committee's chairman, Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.), of "doing the work of the White House" in an interview on Thursday.

House Minority Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) voiced her concerns about the probe under Republican leadership in a letter to Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) on Thursday.

"Political haste must not cut short valid investigatory threads. Key questions about foreign interference in our elections remain, and must be thoroughly investigated," Pelosi wrote.

Ryan's spokeswoman issued a statement earlier this year saying the probe would continue.

"The House Permanent Select Committee on Investigation is conducting a thorough and professional investigation into Russian meddling and is following the facts wherever they may lead," AshLee Strong said.