The House Intelligence Committee on Tuesday subpoenaed former White House chief strategist Stephen Bannon after he declined to answer investigators’ questions in their probe into Russian interference in the presidential election, according to multiple sources.

According to one source, Bannon did not immediately comply with the subpoenas, which were for both testimony and documents.

Rep. Mike Conaway Kenneth (Mike) Michael ConawayLive coverage: Democrats, Republicans seek to win PR battle in final House impeachment hearing Laughter erupts at hearing after Democrat fires back: Trump 'has 5 Pinocchios on a daily basis' Live coverage: Schiff closes with speech highlighting claims of Trump's corruption MORE (R-Texas) later told reporters that there was only a subpoena to compel testimony and that it remained in effect at the close of the interview.

Bannon appeared to pique lawmakers when he tried to cite executive privilege to avoid answering some questions related to his work for President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

“I certainly think that when the committee expects an executive privilege, when does that attach is the question that is sort of dominating the day. You know, at what time does it attach? During the transition or during the actual swearing in?” Rep. Tom Rooney Thomas (Tom) Joseph RooneyHouse Dem calls on lawmakers to 'insulate' election process following Mueller report Hill-HarrisX poll: 76 percent oppose Trump pardoning former campaign aides Dems fear Trump is looking at presidential pardons MORE (R-Fla.) said to reporters. He declined to comment on the issuance of the subpoenas, first reported by Fox News’s Chad Pergram.

Bannon joined the Trump campaign in August of 2016, stayed on through the transition and left the White House in August of 2017.

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The move to issue a subpoena during the middle of an interview is an unusual one — and is a departure from how committee lawmakers have handled other witnesses who have declined to answer certain questions.

Trump recently had a very public break with Bannon after the publication of a controversial book in which Bannon is quoted. Trump that “Sloppy Steve” has “been dumped like a dog by almost everyone.”

In the book, "Fire and Fury: Inside the Trump White House" by author Michael Wolff, Bannon said that a June 2016 meeting at Trump Tower between campaign officials and a Russian lawyer believed to have political dirt on then-Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE was “treasonous.”

Earlier on Tuesday, The New York Times reported that 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 last week hit Bannon with a separate, grand jury subpoena in the federal investigation. The news broke publicly just hours after Bannon walked into the Intelligence Committee’s secure spaces.

Committee Chairman Devin Nunes Devin Gerald NunesSunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington Sunday shows preview: White House, congressional Democrats unable to breach stalemate over coronavirus relief MORE (R-Calif.) told reporters that he authorized the congressional subpoenas, saying, “That’s how the rules work.”

--This story was updated at 9:25 a.m.