Former Trump campaign aide Sam Nunberg is slated to meet in January with the Senate Intelligence Committee as the panel continues to investigate Russian interference in the 2016 presidential election.

Nunberg confirmed to The Washington Post that the meeting has been scheduled and said he is "happy to cooperate and appear” in front of the committee. The meeting is likely to be a closed session, according to The Post.

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Nunberg also told the newspaper that he is uncertain about what subjects he'll discuss with the committee but predicted he would answer questions about longtime Trump ally Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE and the Trump campaign.

Stone has appeared at the center of 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 probe into Russian interference in the 2016 election because of his apparent ties to WikiLeaks in the months leading up to the election.

Mueller is thought to be looking into whether Stone or anyone else had information in advance of WikiLeaks publishing hacked Democratic emails, including those from John Podesta, Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's campaign chairman.

Nunberg, who in 2015 worked on Trump's presidential campaign, testified in March before a grand jury as part of Mueller's investigation after he initially said he would ignore Mueller's subpoena.