CBS reporter Robert Costa pushed back on CBS White House correspondent Ed O’Keefe after he suggested that Democrats were calling on President Joe Biden to drop out of the race following the assassination attempt on former President Donald Trump. During a discussion on Face the Nation, host Margaret Brennan asked O’Keefe if Biden was changing his campaign plans following the shooting. O’Keefe, who has frequently criticized the president, admitted he didn’t know but insisted Democrats were calling on Biden to drop out after a poor debate performance. Want more breaking political news? Click for …