President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Thursday endorsed Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas) ahead of his reelection bid next year as 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) says he's considering entering the race.

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

As he has in Twitter endorsements for other candidates, Trump praised Cornyn's positions on "Crime, the Border, the Second Amendment" and the military and veterans.

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

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Cornyn announced in 2017 he would run for another term.

Trump's endorsement comes roughly 20 months ahead of the 2020 election, but just days after O'Rourke said he is considering a Senate bid to challenge Cornyn.

O'Rourke, who generated national buzz in his unsuccessful effort to unseat Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) in November, is considered as a possible 2020 presidential candidate, but said he's keeping his options open.

"I'm trying to figure out how I can best serve this country — where I can do the greatest good for the United States of America. So, yeah, I'm thinking through that and it, you know, may involve running for the presidency. It may involve something else," O'Rourke said after being asked if he's considering challenging Cornyn.

Trump visited El Paso, Texas, earlier this month for his first campaign rally of 2019 amid a push for funding for a wall along the southern border.

O'Rourke held a rival event at the same time, reviving speculation over whether he would enter an increasingly crowded field of candidates seeking the Democratic presidential nomination in 2020.