Steve Bannon was subpoenaed last week to testify before a grand jury in special counsel Robert Mueller's investigation into possible links between Trump associates and Russian Federation, the New York Times reported on Tuesday.
Former White House strategist Steve Bannon speaks during a Roy Moore campaign rally in Fairhope, Ala., Dec. 5, 2017.
Former Trump campaign manager Corey Lewandowski will also testify in front of the Committee and will maintain the position there was no collusion with Russian Federation on any front during the 2016 presidential election.
"Even if you thought that this was not treasonous, or unpatriotic, or bad s--, and I happen to think it's all of that, you should have called the Federal Bureau of Investigation immediately", Bannon added.
However, the summons could be a tactic to induce Bannon to cooperate fully with Mueller's investigation, the paper said. It adds that Mueller could potentially allow Bannon to avoid a grand jury appearance if he agrees to answering questions by investigators at the special counsel's office.
The testimony comes just one week after a very public excommunication from Trump's closest confidants following the publication of Michael Wolff's "Fire and Fury".
About one-third of Trump voters say they read Breitbart News either sometimes or regularly.
White House Communications Director Hope Hicks, who served as Trump's spokeswoman during his presidential campaign after a tenure with his Trump Organization real estate business, is also expected to be questioned by the committee this week, according to a congressional source. But the president attracted scrutiny last summer when The Washington Post reported that he "dictated" an initially misleading statement that Trump Jr. released in response to reports about the Trump Tower meeting.
Mr Bannon was present for several controversial moments in the Trump administration, including the firing of former national security adviser Michael Flynn after he misled the Vice President about his dealings with Russian Federation.
Mr Trump responded to the book by distancing himself from Mr Bannon, claiming his former top adviser had little to do with the administration or the campaign's victory.
Other than Mr Bannon, no member of Mr Trump's inner circle has been called to testify before the grand jury, which was impanelled in August.