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.

Texas Attorney General Ken Paxton leads incumbent Senator John Cornyn on the eve of the state’s Republican U.S. Senate runoff election, a new poll from Quantus Insights shows on Monday. The race advanced to a Republican runoff after neither Cornyn nor Paxton won a majority in March,

President Trump has endorsed Texas Attorney General Ken Paxton over incumbent Senator John Cornyn before the Senate Republican runoff on Tuesday. CBS News' Fin Gómez reports.

Texas, discusses President Donald Trump’s endorsement of Texas Attorney General Ken Paxton in the Texas GOP U.S. Senate runoff on ‘Sunday Night in America.’

Voters in Texas will see little of the Republican candidates for U.S. Senate on Monday. But that’s only if they stay away from screens.

President Donald Trump has railed against Texas Senator John Cornyn as “VERY disloyal” on social media as he backed his opponent in Tuesday’s Senate primary runoff, the state’s Attorney General Ken Paxton.

Texas GOP Senate candidate Ken Paxton discusses his campaign following President Donald Trump's endorsement and addresses criticisms from opponent John Cornyn and other Republican senators on 'The Big Weekend Show.

Turnout becomes crucial as Ken Paxton allies try to keep supporters engaged and John Cornyn fights to prove the Republican race remains competitive.