PLANO, Texas (AP) — Texans are choosing a Republican nominee for U.S. Senate in Tuesday’s runoff election, bringing to a close the extended, bitter and expensive primary where President Donald Trump weighed in late to tip the race in another effort to rid the GOP of leaders less devoted to him.

Trump’s endorsement of state Attorney General Ken Paxton over four-term Sen. John Cornyn gives the challenger a late boost and puts Cornyn at risk of becoming the first Republican senator in Texas history to seek the party’s nod and lose.