 DURING A ROLL CALL VOTE TODAY AT 3 PM EASTERN. WE'LL GO LIVE TO THE CONVENTION'S FIRST SESSION EXPECTED SOON IN THIS BROADCAST. AS SOON AS THAT HAPPENS, WE'LL SHOW IT TO YOU. BUT ALSO OUR VIDEO FEED SHOWING DONALD TRUMP GETTING OFF OF HIS PLANE IN MILWAUKEE, WISCONSIN. IN FACT, CBS NEWS JUST CONFIRMED TRUMP WILL ANNOUNCE HIS CHOICE FOR RUNNING MATE TODAY.