John Cornyn

Days after officially endorsing Texas Attorney General Ken Paxton in the GOP Senate runoff, President Donald Trump on Sunday renewed his push for Texas Republicans to back Paxton ahead of Tuesday's closely watched runoff election against incumbent Sen. John Cornyn.

In a lengthy Truth Social post, Trump praised Paxton's tenure as attorney general, highlighted his loyalty during the president's legal battles, and sharply criticized Cornyn over election integrity and immigration issues.

"TEXAS, REMEMBER! Ken Paxton was a GREAT Attorney General, probably the best in the Country," Trump wrote. "He was also very loyal to your favorite President, ME, as the Dumocrats played their ultimate game of Weaponization, and failed, BADLY!"

Trump also touted his own electoral success in Texas while accusing Cornyn of failing to support key conservative priorities.

"Ken's opponent was VERY disloyal to me, as President, and didn't fight hard enough for the desperately needed SAVE AMERICA ACT – VOTER I.D., PROOF OF CITIZENSHIP, NO MAIL-IN BALLOTS," Trump wrote, before urging voters to support Paxton on Tuesday.

The race has become one of the nation's most closely watched Republican primary contests, drawing millions in campaign spending and serving as another major test of Trump's influence within the GOP.

Earlier Sunday, Paxton appeared on Newsmax's "Wake Up America Weekend," where he credited Trump's endorsement and recent advertising efforts with helping build momentum in the final days of the campaign.

"Now that we've defined John and people understand what he's about, we finally had enough money to get a message out about what he actually believes, which is that he fought the border wall," Paxton said.

"He's pro-amnesty. He didn't want Donald Trump to be reelected," Paxton added.

Paxton has campaigned heavily on immigration enforcement, election security, and support for Trump's America First agenda, while Cornyn has pointed to his long Senate record and influence within the Republican conference.

Tuesday's runoff is expected to draw significant turnout and could reshape the political landscape in Texas, where Trump-backed challengers increasingly have targeted longtime Republican incumbents viewed as insufficiently aligned with the president's agenda.