After a brief exchange with reporters on the White House lawn, POTUS was just joined by First Lady and Baron and boarded Marine One to go to Andrews for trip to Alabama today.
The footage shown on FNC (and others) was taped when POTUS was departing WH; after playback they just showed LIVE, POTUS with First Lady Melania and Baron scaling the stairs to AF1 and has just boarded for trip to Alabama.