Former President Donald Trump has expanded his lead in the Republican primary race, while President Joe Biden continues to face uncertainty among Democratic primary voters, according to the latest Fox News national survey. Republican primary voters were read a list of 15 announced and potential candidates for the 2024 nomination. The survey, released Wednesday, finds Trump has doubled his lead since February and is up by 30 points over Ron DeSantis (54%-24%). Last month, he was up by 15 (43%-28%). No one else hits double digits. Mike Pence comes in third with 6%, Liz Cheney and Nikki Haley receive 3%...