By Bill Hutchinson, San Francisco Chronicle

President Trump is considering reaching back into a pool of retired military generals to replace Michael Flynn as national security adviser.

Trump tweeted Friday that retired Army Lt. Gen. Keith Kellogg is among four candidates for the to take over for Flynn, who resigned Monday after giving a briefing to Vice President Mike Pence on his pre-election conversation with Russias U.S. ambassador that the president considered unsatisfactory.

Photo: Susan Walsh, Associated Press

Acting National Security Adviser Keith Kellogg waits for the arrival of President Trump at the top of the steps of Air Force One at Andrews Air Force Base in Md., Friday, Feb. 17, 2017.

Acting National Security Adviser Keith Kellogg waits for the arrival of President Trump at the top of the steps of Air Force One at Andrews Air Force Base in Md., Friday, Feb. 17, 2017.

Trump Today: Retired Lt. Gen. Kellogg 1 of 4 candidates for NSA

Leaked information on the phone call between Flynn and Ambassador Sergey Kislyak indicates they discussed U.S. sanctions on Russia, the Washington Post reported.

General Keith Kellogg, who I have known for a long time, is very much in play for NSA - as are three others, Trump tweeted.

Kellogg joined Trump on Air Force One Friday as the president traveled to Charleston, S.C., for an event at a Boeing plant.

Following the resignation of Flynn, a retired Army lieutenant general, Trump named Kellogg his acting national security adviser. Kellogg has been serving as chief of staff on the National Security Council.

Kellogg, 72, served more than 30 years in the Army and was director of the Coalition Provisional Authority in Iraq following 2003 invasion of the country.

Kelloggs name emerged as Flynns replacement a day after former Vice Admiral Robert Harward turned down Trumps offer take on the post, which does not require a Senate confirmation hearing.

The Chronicle has published several articles on Flynns resignation. Here are some links:

Trump Today: President says Russian phone call leaks un-American

Trump Today: President says Flynn resigning not the real story

Trump knew Flynn misled WH weeks before ouster: officials

Bill Hutchinson is a San Francisco Chronicle staff writer. Email: bhutchinson@sfchronicle.com Twitter: @bill_hutchinson

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Trump Today: Retired Lt. Gen. Kellogg 1 of 4 candidates for NSA - SFGate