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 decision to tap Matthew Whitaker as acting attorney general has “no effect” on an ongoing legal challenge to 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 authority, prosecutors working for the special counsel said in a court filing on Monday.

Mueller’s team addressed Whitaker’s appointment in a supplemental brief filed in the case involving Andrew Miller, an associate of longtime Trump ally Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE. Miller is currently fighting a subpoena to testify before the grand jury in the special counsel’s Russia investigation.

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Trump announced in early November that Whitaker would replace Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE in an acting capacity after Sessions resigned as attorney general at the president’s request. Some of Trump’s critics have warned that Trump could be laying the groundwork to interfere in the Mueller investigation. Whitaker, who worked as Sessions’s chief of staff, has in the past been critical of the probe.

A federal appeals court in D.C. had asked Mueller’s team and Miller to each file briefs addressing what impact, if any, Whitaker’s appointment would have on the ongoing legal battle. Both argued in separate filings that the appointment has no impact on the legal arguments in the case.

“Acting Attorney General Whitaker’s designation neither alters the Special Counsel’s authority to represent the United States nor raises any jurisdictional issue,” Mueller’s team wrote in the filing on Monday. “The Special Counsel continues to exercise the same authority, and the jurisdiction of the district court and this Court is intact.”

Miller is challenging the constitutionality of Mueller’s appointment, arguing that he should have been appointed by the president and confirmed by the Senate as a “principal officer,” or otherwise should have been appointed as an “inferior officer” by Sessions — not by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, who had been overseeing the probe up until Whitaker took the helm of the department earlier this month.

Lawyers representing Concord Management and Consulting, an organization accused of funding a Russian troll farm, unsuccessfully made a similar argument earlier this year in an attempt to dismiss an indictment filed by Mueller’s team.

Mueller has an interest in Miller ostensibly for his connection to Stone, who has drawn scrutiny as a result of his public statements about WikiLeaks before the 2016 election. The special counsel has questioned a slew of Stone associates in an effort to determine what, if any, advanced knowledge anyone in Trump’s orbit had of hacked Democratic emails leaked by WikiLeaks before Election Day.