Bill Murray Crashes White House Briefing

Ladies and gentlemen, please rise for the President of the Un ... BILL MURRAY!

Bill took over the podium in the White House's press briefing room on Friday -- but instead of talking politics, he was all about the NLCS ... and explained why the Dodgers are doomed.

Oh yeah, he happens to be a HUGE Chicago Cubs fan -- hence the pullover -- and warned Clayton Kershaw that his boys from Chi-Town are just too dominant for him.