text:  NPR's Sarah McCannon has more from Milwaukee. Former President Trump announced that he'd selected Ohio Senator J.D. Vance as his running mate on Monday afternoon in a social media post. A couple of hours later, Vance was introduced on the floor of the Republican National Convention, where delegates formally voted to select him as the vice presidential nominee. The question is on the motion that Senator J.D. Vance be nominated by acclamation. All those in favor, signify by saying aye.