A supercharged U.S. Senate GOP primary in Texas between Sen. John Cornyn and state Attorney General Ken Paxton is off to a fast start of personal attacks and expectations of a high-spending race.

Texas Attorney General Ken Paxton’s decision to challenge Sen. John Cornyn sets up what’s likely to be a bitter and expensive Republican primary – and a battle for President Donald Trump’s endorsement.

Republican Rep. Lance Gooden of Texas is taking sides in the Lone Star State's burgeoning GOP Senate primary battle, endorsing state Attorney General Ken Paxton over longtime Sen. John Cornyn