President Trump on Friday offered up a candidate to replace Michael Flynn as national security adviser, tweeting that retired Army Lt. Gen. Keith Kellogg is among four candidates.

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

General Keith Kellogg, who I have known for a long time, is very much in play for NSA - as are three others. — Donald J. Trump (@realDonaldTrump) February 17, 2017

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Kellogg was initially named acting national security adviser following Flynn's ouster on Monday. He previously served as Flynn’s chief of staff on the National Security Council.

Kellogg was an adviser to Trump during his presidential campaign and was appointed National Security Council chief of staff in December.

Kellogg, 72, was born in Ohio and spent more than 30 years in the Army, including a key post in the 2003 invasion in Iraq. After retirement, he worked for a number of contracting firms, including tech giant Oracle.