(CNN) -- Former Attorney General Jeff Sessions announced a campaign for his old Alabama Senate seat on Thursday, betting that the leader of the Republican Party will not break the bond he built with the state's voters over two decades.

Jeff Sessions

Jeff Sessions

The announcement came a year after President Donald Trump fired Sessions from his dream job, and their relationship will now be a determining factor in the race.

While Sessions has been beloved in Alabama — his last Senate campaign in 2014 was unopposed — Trump commands higher approval ratings there than just about any other state. And the President spent months criticizing his first attorney general, personal attacks that could very well sway the party's primary on March 3.

Sessions referenced his departure from Trump's administration in a campaign announcement video published Thursday night.

"When I left President Trump's Cabinet, did I write a tell all book? No. Did I go on CNN and attack the President? No. Have I said a cross word about President Trump? No," Sessions says in the video. "And I'll tell you why: First, that would be dishonorable. I was there to serve his agenda, not mine. Second, the President is doing a great job for America and Alabama, and he has my strong support."

Sessions, a conservative budget hawk and immigration hardliner, was the first senator to endorse Trump in the 2016 presidential election. In 2017, Trump rewarded Sessions, who served as a former US attorney and state attorney general before being elected to the Senate in 1996, to lead the Justice Department.

Sessions referenced his endorsement of Trump in his Thursday night video.

"When President Trump took on Washington, only one senator out of a hundred had the courage to stand with him: me," he says. "I was the first to support President Trump. I was his strongest advocate. I still am."

But Sessions did not leave on good terms. After Sessions recused himself from the department's investigation of Russian interference in the 2016 election, Trump spent months ridiculing him both in public — and reportedly continues to do so in private.

Other Republican candidates are already pitching themselves as better stewards of Trump's political brand. Former Auburn football coach Tommy Tuberville, US Rep. Bradley Byrne, Secretary of State John Merrill, former Chief Justice Roy Moore, State Rep. Arnold Mooney and businessman Stanley Adair are all running for the party's nomination.

Tuberville took a shot at Sessions on Wednesday, calling him a has-been who lost his opportunity to defend Trump.

"As Attorney General, Jeff Sessions had his chance to have President Trump's back and take on the establishment politicians and he failed," he said. "I will bring a new voice for Alabama to the Senate and I will always have President Trump's back."

But other Alabama Republicans said Sessions still holds political power in the state. GOP Sen. Richard Shelby of Alabama said that he would "absolutely" endorse Sessions, calling him a "formidable candidate."

"Jeff Sessions is a friend," said Shelby. "I worked with him every day up here for 20 years. He's a man of integrity.

Merrill told CNN that if Sessions got in the race, he'd be the frontrunner due to long experience representing Alabama in the Senate.

"No doubt about it," said Merrill. "He held the seat for 20 years."

The race is Republicans' best opportunity to add to their 53-person majority in the Senate. In 2017, Democrat Doug Jones, a US attorney, beat former Chief Justice Roy Moore, who faced allegations that he sexual assaulted teenage girls in his 30s -- charges Moore vehemently denied. Moore also was twice removed from the bench, for refusing a federal order to remove a Ten Commandment monument from the Alabama Supreme Court building and for ordering judges to not heed the Supreme Court's ruling on same-sex marriage.

While Moore is running again for Senate, many Republican strategists hope the party will nominate another candidate. The Senate Republican campaign arm has taken an-anyone-but-Roy-Moore approach.

"I'm not going to get involved in a primary, other than to say that I certainly don't want to see Roy Moore be the candidate," said Sen. Susan Collins, Republican of Maine, who is close enough to Sessions that she introduced him before his 2017 nomination hearing to lead the Department of Justice.

Sen. John Cornyn, Republican of Texas, said he talked to Sessions in person a couple days ago about his hope his former colleague and the President can repair their relationship.

"I told him I hope he and the President can work out their differences, because I think if not it's going to be a pretty miserable experience," said Cornyn. "I told him what he already knew."

Some top Republican officials are expressing their exasperation at Sessions over his decision to jump into the Alabama Senate race, fearing that internal party dispute could help reelect Jones. The Democrat has over $5 million on hand, the most of any candidate in the Senate race, according to the latest filings. Byrne has over $2.5 million, Sessions has over $2.4 million and Tuberville has over $1.4 million.

At a breakfast meeting on Thursday with about 50 lobbyists and others, officials from the National Republican Senatorial Committee openly voiced their concern about Sessions, according to two people in the room. The frustration was not rooted in dislike for the longtime senator, but rather the uncertainty over Trump's reaction to his former attorney general.

Sessions has not returned calls from the National Republican Senatorial Committee, two officials tell CNN, and is keeping counsel with a tight group of longtime advisers and friends.

"There is no one the President hates more and if he's the nominee and Trump continues to dump on him, Jones could be reelected," one Republican official told the crowd.

Sessions' announcement came one day before Alabama's filing deadline — and two days before Trump heads to Tuscaloosa for the University of Alabama-Louisiana State University football game.

Jones told CNN that he'll go to the game with West Virginia Sen. Joe Manchin, a Democrat and childhood friend of Alabama coach Nick Saban.

"It's going to be bedlam," Jones said.

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