 formally nominated the 39-year-old yesterday on the opening day of the Republican National Convention in Milwaukee. A jubilant Vance pumped his fist in the air when it became official. Donald Trump made his first public appearance since being injured in an assassination attempt on Saturday. He entered the Republican National Convention last night to a live performance of Lee Greenwood's God Bless the USA. Widespread applause from the crowd this after he officially secured the GOP nomination for president.