 Don Jr., the eldest child of the former president, had been backing Vance as the VP pick early on. He says Vance has proven himself an effective politician in Congress and capable of advocating for Trump's cause in the media. Speaking to reporters on the RNC convention floor, Don Jr. says he couldn't be happier with his father's choice. Beyond his talents, beyond his intelligence, beyond his business acumen, and frankly what he's accomplished already as a first-term senator, I couldn't be happier.