A super PAC backing Texas Attorney General Ken Paxton (R) for Senate is airing television ads in Palm Beach, Fla., where President Trump is spending the weekend at his Mar-a-Lago resort, as his endorsement in a competitive primary runoff hangs in the balance. Lone Star Liberty PAC came out with a new television ad on Friday that accuses Paxton’s opponent, Rep. John Cornyn (R-Texas), of having “betrayed” Trump, citing his votes to confirm Merrick Garland as U.S. attorney general and Lisa Monaco as deputy attorney general in 2021. “John Cornyn betrayed President Trump, and he doesn’t deserve our trust” the...