Speaker 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.) on Thursday declined to criticize 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 while in Europe for the anniversary of D-Day, the same day Trump criticized her during an interview and labeled her "Nervous Nancy."

“I don’t talk about the president while I’m out of the country. That’s my principle,” she told reporters when asked about Trump's new tariff policy.

Her remark came shortly after Trump discussed her during an exclusive interview with Fox News on Thursday, in which he called her "Nervous Nancy” over House Democrats’ efforts to get 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 to testify before Congress.

“Nancy Pelosi, I call her Nervous Nancy, Nancy Pelosi doesn’t talk about it,” Trump said. “Nancy Pelosi is a disaster, OK? She’s a disaster. Let her do what she wants, you know what? I think they’re in big trouble.”

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The comments come as House Democrats and the White House continue their feud over a slate of oversight probes into the administration. Trump has directed several former and current officials to defy subpoenas from a slew of committees for documents and testimony, enraging committee chairs and ramping up calls for impeachment among rank-and-file members.

Democrats are also clamoring for testimony from Mueller regarding his investigation into Russian election interference in 2016 and hope to question him over whether he believes Trump obstructed investigations into the interference.

The special counsel wrote in his report that he could not make a prosecutorial decision over obstruction of justice, citing existing Justice Department guidelines that prevent the indictment of a sitting president, though maintained last week that he could not exonerate Trump.

“If we had had confidence that the president clearly did not commit a crime, we would have said so,” the special counsel said at a press conference.

However, he added that he has no intention of testifying before Congress.

“I hope and expect this to be the only time that I will speak about this matter,” he said. “The report is my testimony.”

Pelosi’s office did not immediately respond to a request for comment over the new nickname.