In a sweltering Rose Garden on Thursday, as President Donald Trump intoned at length about restoring faith to the White House, he took a moment to single out a man sitting right up front.

The remarkable shake-up followed reports that Michael Waltz, who has lost favor with Trump loyalists, was to be replaced as national security adviser.

U.S. President Donald Trump ousted his national security adviser Mike Waltz on Thursday and named Secretary of State Marco Rubio as his interim replacement in the first major shakeup of Trump's inner circle since he took office in January.