Former President Donald Trump's youngest son, Barron Trump, has been chosen to serve as a Florida delegate to the Republican National Convention, the state party chairman said Wednesday. Republican Party of Florida chairman Evan Power said the 18-year-old high school senior will serve as one of 41 at-large delegates from Florida to the national gathering, where the GOP is set to officially nominate his father as its presidential candidate for the November general election. NBC News first reported the choice of Barron Trump as a delegate.