Former U.S. Ambassador to the U.N. John Bolton speaks at the Conservative Political Action Conference in Oxon Hill, Md. in this February 24, 2017 file photo.
FORMER U.S. AMBASSADOR to the U.N. John Bolton speaks at the Conservative Political Action Conference in Oxon Hill, Md in this Feb. 24, 2017 file photo. President Trump is replacing National security adviser H.R. McMaster with Bolton.