Deputy Attorney General Rod Rosenstein said Wednesday that he has seen no good cause to fire Robert Mueller from his role as special counsel in the investigation into Russian interference in the 2016 election.

Rosenstein faced tough questions from Republicans on the House Judiciary Committee Wednesday amid revelations that FBI officials on Mueller’s team had exhibited political bias. President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s allies have seized on the reports to discredit the investigation.

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Rosenstein on Wednesday defended the special counsel, telling ranking member Jerrold Nadler (D-N.Y.) that he has seen no good cause to fire Mueller.

The deputy attorney general, who is overseeing the Russia probe after Attorney General 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 recused himself, told lawmakers that Mueller had taken the appropriate action by firing an FBI agent on the investigation over anti-Trump text messages he had sent to a colleague during the campaign.

“Have you seen good cause to fire special counsel Mueller?” Nadler asked Rosenstein.

“No,” Rosenstein replied.

Later, when asked what he would do if he were directed to fire Mueller, Rosenstein replied, “I would follow the regulation. If there were good cause, I would act. If there were no good cause, I would not.”

The deputy attorney general then repeated that he had not seen good cause to fire Mueller.

Later, Rosenstein spoke highly of Mueller when asked to explain the characteristics that qualified him to be appointed special counsel.

“Based upon his reputation, his service, his patriotism, and his experience with the department and the FBI, I believe he was an ideal choice for this task,” Rosenstein said in response to Rep. Steve Cohen Stephen (Steve) Ira CohenTennessee Rep. Steve Cohen wins Democratic primary Democrats exit briefing saying they fear elections under foreign threat Texas Democrat proposes legislation requiring masks in federal facilities MORE (D-Tenn.)