News Ex-Massachusetts Gov. William Weld to challenge Trump for Republican nomination in 2020 February 15, 2019Holly Ramer and Bob Salsberg, Associated PressComments Off on Ex-Massachusetts Gov. William Weld to challenge Trump for Republican nomination in 2020 William Weld, a former Massachusetts governor who ran for vice president on the Libertarian Party ticket in 2016, became the first Republican to take a serious step toward challenging President Donald Trump in 2020.