Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) will question ousted FBI director James Comey at the highly anticipated Senate Intelligence Committee hearing on Thursday, CNN reported Tuesday.

McCain serves as an ex-officio member of the intel panel because he is chair of the Armed Services Committee. As such, he is invited to attend the hearing during which the committee will hear testimony from Comey on Russian election interference.

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A spokesperson for McCain did not immediately respond to a request for confirmation of the CNN report.

The hearing is expected to delve into the circumstances surrounding President Trump’s firing of Comey last month, which has spurred allegations of possible obstruction of the FBI’s Russian interference investigation.

McCain has been one of President Trump’s fiercest GOP critics. He has sounded alarm over Russian meddling in the 2016 presidential election, spearheading bipartisan legislation that would impose new sanctions on Moscow.

McCain expressed disappointment over Trump’s decision to fire Comey last month, renewing a call for the formation of a special congressional committee to investigate Moscow’s election interference.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) and Minority Leader Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) are also ex-officio members of the Intelligence Committee, along with Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), the top Democrat on Armed Services. An aide to Schumer told The Hill that he has no plans to attend the hearing.

The open hearing will take place Thursday morning, and the committee will proceed into a closed session later in the day.

Jordain Carney contributed.