Keith Kellogg

Joseph Keith Kellogg Jr. (born May 12, 1944), known as Keith Kellogg, is a retired general officer in the United States Army. President Donald Trump put Kellogg in charge of the presidential transition agency action team for defense. He was named a foreign policy advisor to then presidential candidate Trump in March 2016. 
He was named Acting United States National Security Advisor on February 13, 2017 following the resignation of Michael T. Flynn.