President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Tuesday endorsed former Auburn University football coach Tommy Tuberville in his Alabama runoff election against Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE, dealing a blow to Trump's former attorney general as he attempts to get back into the Senate.

"Coach Tommy Tuberville, a winner, has my Complete and Total Endorsement. I love Alabama!" Trump tweeted.

The president praised Tuberville as a "terrific head football coach at Auburn University" and a "REAL LEADER who will never let MAGA/KAG, or our Country, down!" Tuberville thanked Trump in a tweet of his own, saying he was "Looking forward to helping you drain the swamp and #KAG!"

....(which is under siege), is strong on Crime and the Border, and truly LOVES our Military and our Vets. He will be a great Senator for the people of Alabama. Coach Tommy Tuberville, a winner, has my Complete and Total Endorsement. I love Alabama! — Donald J. Trump (@realDonaldTrump) March 11, 2020

Tuberville and Sessions will be on the ticket in a runoff election on March 31 after no candidate received 50 percent of the vote in last week's GOP primary. Tuberville and Sessions were the top two vote-getters in the primary, with roughly 33 percent and 32 percent of the vote, respectively.

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Trump had remained neutral in the race leading up to the primary.

But his endorsement on Tuesday could deal a fatal blow to Sessions's campaign for his old Senate seat, which he vacated when he joined the president's Cabinet as attorney general. Sessions was the first U.S. senator to endorse Trump during the 2016 campaign but has since become a punching bag for the president.

Trump has repeatedly excoriated Sessions over his decision to recuse himself from overseeing the investigation into Russian interference in the 2016 election. He mocked Sessions's accent, urged him to unrecuse himself, and described him as a "total disaster" and "an embarrassment to the great state of Alabama."

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Sessions has remained loyal, refusing to criticize the president publicly and building his Senate campaign on his efforts to implement Trump's agenda.

Tuberville, meanwhile, has sought to cast Sessions as insufficiently loyal to the president, citing his role in the Russia probe.

Whichever Republican emerges from the runoff will likely be favored to defeat Sen. Doug Jones (D-Ala.) in November.

Jones won the special election to replace Sessions in 2017, defeating former Judge Roy Moore Roy Stewart MooreVulnerable Senate Democrat urges unity: 'Not about what side of the aisle we're on' Sessions hits back at Trump days ahead of Alabama Senate runoff Judge allows Roy Moore lawsuit over Sacha Baron Cohen prank to proceed MORE to become the first Democrat in Alabama elected to the U.S. Senate in 25 years. Moore faced allegations of sexual misconduct and inappropriate interactions with young girls during the campaign.