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 told lawmakers Thursday that he is unaware of any conflicts of interest that would disqualify 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 for leading the federal investigation into Russian interference.

Rosenstein’s answer came in response to questioning during a House Judiciary Committee oversight hearing on the Justice Department’s actions leading up to the 2016 presidential election. Hours earlier, 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 wrote on Twitter that Mueller should “list his conflicts of interest.”

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“Does Bob Mueller have any conflicts of interest?” Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.) asked Rosenstein, the Justice Department official overseeing the Russia investigation, during the hours-long hearing Thursday.

“If there were any conflicts of interest that were brought to our attention, I would discuss it with Mr. Mueller and then there could be review within the department if there were a credible allegation of a conflict of interest,” Rosenstein said. “I am not aware of any disqualifying conflict of interest.”

Some have alleged that Mueller’s friendship with former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE, with whom he worked at the FBI, represents a conflict that should disqualify Mueller from the probe.

Trump tweeted Thursday morning in advance of the hearing, “When is Bob Mueller going to list his Conflicts of Interest? Why has it taken so long? Will they be listed at the top of his $22,000,000 Report.”

“And what about the 13 Angry Democrats, will they list their conflicts with Crooked H? How many people will be sent to jail and … persecuted on old and/or totally unrelated charges (there was no collusion and there was no obstruction of the no collusion)...And what is going on in the FBI & DOJ with Crooked Hillary, the DNC and all of the lies? A disgraceful situation!” Trump wrote.

Thursday’s oversight hearing centered on a bombshell Justice Department inspector general report that chastised Comey for his decisions while he served as director of the FBI in 2016 regarding the investigation into former Sectary of State Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's email use.

The investigation also revealed FBI agents exchanging text messages negatively characterizing Trump before the election. Republicans have seized on the messages as proof of bias against the president within the bureau.