Gen. Mike Flynn (Ret.) resigned Monday night as President Donald Trump’s National Security Adviser, according to numerous reports. Flynn has been the subject of a concerted attack over his contacts with Russia and whether he was truthful in explaining those contacts to Vice President Mike Pence.

Replacement candidates are already being floated.

A copy of Flynn’s resignation letter was posted by the Washington Post’s Abby D. Phillip along with news of his interim successor.

In resignation statement, Flynn apologizes, blames "the fast pace of events" for the fact that he gave misinformation to Pence pic.twitter.com/mrZ7EfKtft — Abby D. Phillip (@abbydphillip) February 14, 2017

Confirmed: Flynn has resigned. Senior Admin official says Rt. General Keith Kellogg will serve as interim national security adviser. — Abby D. Phillip (@abbydphillip) February 14, 2017

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“Confirmed: Flynn has resigned. Senior Admin official says Rt. General Keith Kellogg will serve as interim national security adviser.”

Per two senior admin officials: Gen. Keith Kellogg, Vice Admiral Robert Harward and Gen. David Petraeus all in the running to replace Flynn — Abby D. Phillip (@abbydphillip) February 14, 2017

“Per two senior admin officials: Gen. Keith Kellogg, Vice Admiral Robert Harward and Gen. David Petraeus all in the running to replace Flynn”

ABC News posted a copy of the White House release on the National Security Adviser shuffle.

NEW: White House says Pres. Trump has named Lt. General Joseph Keith Kellogg, Jr. Acting National Security Advisor https://t.co/I9v8XORgo2 pic.twitter.com/wAQtp0lLKD — ABC News Politics (@ABCPolitics) February 14, 2017

NEW: White House says Pres. Trump has named Lt. General Joseph Keith Kellogg, Jr. Acting National Security Advisor