Sen. John Cornyn John CornynSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Texas) won his party's Senate primary Tuesday, defeating his closest opponent by double digits.

Cornyn held a comfortable lead over his GOP challengers as election results came in Tuesday evening, defeating four Republican primary contenders who all lack experience in government at the state or national level.

The Texas incumbent won an endorsement for reelection from President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE last February when it was reported that former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) was considering entering the race against him. O'Rourke later opted to continue his presidential campaign instead.

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"Senator John Cornyn has done an outstanding job for the people of Texas," Trump tweeted last year, adding that the three-term senator had his "complete and total endorsement."

Senator John Cornyn has done an outstanding job for the people of Texas. He is strong on Crime, the Border, the Second Amendment and loves our Military and Vets. John has my complete and total endorsement. MAKE AMERICA GREAT AGAIN! — Donald J. Trump (@realDonaldTrump) February 21, 2019

A number of Democratic challengers have declared for the seat, with Air Force veteran M.J. Hegar and state Sen. Royce West leading the field as results poured in Tuesday evening.