 I'm Matt Piper at the Republican National Convention in Milwaukee. The big news here, Donald Trump, who received his party's nomination for president, chooses J.D. Vance as his running mate. Former House Speaker Kevin McCarthy. He has an unbelievable story. Growing up in a mobile home park by a single mother, he understands what drugs has done to our society. Vance is a freshman senator from Ohio and just 39 years old.