Texas Sen. John Cornyn is facing Texas Attorney General Ken Paxton in today's GOP Senate runoff after neither candidate secured enough votes in the March primary to win the nomination. President Donald Trump endorsed Paxton last week.

Sen. John Cornyn’s uphill battle for renomination from his party reaches its conclusion Tuesday. Cornyn’s race against state Attorney General Ken Paxton was considered highly competitive until a week ago,

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,

Texas GOP primary runoff heats up as Ken Paxton secures a late endorsement from Donald Trump, sparking electability warnings from incumbent Senator John Cornyn.

Texas Senate candidates Sen. John Cornyn and Attorney General Ken Paxton were not in the public eye on the last day of campaigning ahead of Tuesday's runoff — but their faces are unavoidable on TV.

Trump's candidate, Texas Attorney General Ken Paxton, has faced numerous scandals, while Sen. John Cornyn has failed to excite the base.

Tuesday’s primary runoffs in Texas will put President Donald Trump’s endorsement to the test again — the latest step in a mission to punish some incumbent Republicans Trump has deemed insufficiently l

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.