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 on Wednesday defended 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 investigation as "appropriate and independent" as 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 continues to attack the probe as a "witch hunt."

Rosenstein made the remarks during an interview with the Wall Street Journal, just weeks after reports emerged that he was going to leave his post at the Justice Department. He has remained in his position.

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Mueller told the Journal that Mueller's probe has already revealed wide-ranging efforts by Russia to sow discord and meddle in the 2016 presidential election.

“I committed I would ensure the investigation was appropriate and independent and reached the right result, whatever it may be,” Rosenstein said. “I believe I have been faithful to that.”

The president and GOP lawmakers have continued to escalate attacks on Mueller's investigation, accusing investigators of bias against Trump.

“People are entitled to be frustrated, I can accept that,” Rosenstein told the Journal. “But at the end of the day, the public will have confidence that the cases we brought were warranted by the evidence and that it was an appropriate use of resources.”

“I have a solemn responsibility to make sure that cases like that are pursued and prosecuted, and I’m pleased the president has been supportive of that,” he added.

Rosenstein during the interview declined to discuss the reports that he was either planning to resign from his position at the Justice Department or Trump was planning to fire him.

"The president knows that I am prepared to do this job as long as he wants me to do this job," he said. "You serve at the pleasure of the president, and there’s never been any ambiguity about that in my mind."

The deputy attorney general rarely sits down for interviews, even as the president has publicly attacked him and his role in Mueller's investigation.

He would not say when the probe is likely to be completed, the Journal reported.

Multiple GOP lawmakers have threatened to subpoena Rosenstein over a New York Times report that he once considered wearing a wire to record President Trump.

Rosenstein and the Justice Department have fiercely disputed the Times report. NBC News reported that some officials defended the comments as a joke.

Mueller is reportedly expected to present findings related to key aspects of his investigation after this November's midterm elections, Bloomberg reported on Wednesday.