Does Pres. Biden have the authority to revoke and/or deny security clearances? If so,

[Ocelot II]

1. Maybe not, because members of Congress don't have security clearances in the first place.

Unlike officials at federal agencies, lawmakers do not have security clearances per se, experts said. Rather, members of Congress are by tradition deemed inherently trustworthy [Ha, ha!] by dint of the offices they hold, although they are subject to punishment under the House ethics code for revealing classified information. The maximum penalty, which would require a two-thirds vote by the House, is expulsion.

Neither their fellow lawmakers nor any president could take that fundamental presumption of trustworthiness away from them.

“If they remain Members, then they retain eligibility for access to classified information,” Steven Aftergood, a leading expert on government secrecy with the Federation of American Scientists, said in an email. “But if they engaged in constitutionally prohibited actions, then they should be expelled from Congress altogether.”

https://rollcall.com/2021/01/12/when-it-comes-to-security-clearances-rules-for-others-dont-apply-to-congress/