CNN —

       Steve Bannon, a right-wing podcast host and former White House adviser to Donald Trump, was subpoenaed to provide documents and testimony to a federal grand jury investigating January 6, 2021, according to a person familiar with the matter.

       Bannon was subpoenaed roughly a month ago. Neither Bannon nor his attorney responded to request for comment. The subpoena was first reported by NBC News.

       Bannon was among the Trump allies spreading falsehoods that the 2020 presidential election was stolen and ginning up the GOP base.

       “All hell is going to break loose tomorrow,” Bannon predicted to his podcast listeners on January 5, 2021 – the day before the attack on the US Capitol.

       Bannon also urged Trump in December 2020 to focus his attention on January 6, the date of the Electoral College certification vote in Congress, according to the book “Peril,” by authors Bob Woodward and Robert Costa. The authors also reported that Trump called Bannon after a contentious January 5 meeting with then-Vice President Mike Pence, where Pence told Trump he did not have the authority to block the certification of the 2020 election results.

       Bannon defied a subpoena from the House select committee that investigated the attack on the Capitol. A jury found him guilty of criminal contempt of Congress in July 2022. He was sentenced to four months in prison, but his sentence was paused while he appeals his guilty verdict.

       This story has been updated with additional information.