Former White House chief strategist Stephen Bannon reportedly met with 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 investigators multiple times over the past week.

Two sources told NBC News that Bannon was interview by Mueller’s team for nearly 20 hours spread over multiple days.

Mueller’s team is investigating Russian interference in the 2016 election as well as potential ties between President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE and Russia.

Bannon was subpoenaed by Mueller last month and reportedly made a deal with the special counsel to not testify before a grand jury.

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Bannon made an appearance before the House Intelligence Committee on Thursday but refused to answer questions that weren’t pre-approved by the White House, lawmakers said afterward.

"The only questions he would answer were questions that had been scripted, literally scripted, for him by the White House. A set of 25 questions that had been written out for him to which the answer to each must be 'no,'" Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (Calif.), the top Democrat on the committee, said.

Rep. Mike Conaway Kenneth (Mike) Michael ConawayBottom line House Republican introduces amendment to include farm aid in stopgap funding bill Live coverage: Democrats, Republicans seek to win PR battle in final House impeachment hearing MORE (Texas), the Republican leading the committee’s Russia investigation, said after the interview that the committee would examine what further steps they could take to compel Bannon to answer questions.

Bannon, who left the White House in August, was subpoenaed by the committee in January after refusing to answer questions posed during his first interview with the panel.

Mueller has now interviewed dozens of Trump associates and top current and former White House officials as part of his investigation. Four former Trump officials have been indicted, including former campaign chairman Paul Manafort Paul John ManafortFBI official who worked with Mueller raised doubts about Russia investigation Our Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam MORE and former White House national security adviser Michael Flynn.