Former U.S. Attorney General Jeff Sessions addresses a business group in Montgomery, Ala., last year. Sessions announced Thursday that he will run to regain his old Senate seat.

Former Attorney General Jeff Sessions announced Thursday that he is running for his old Senate seat from Alabama, with a message in which he addressed head-on his rocky relationship with President Trump.

“When I left President Trump’s cabinet, did I write a tell-all book, no,” Sessions said in a brief video posted on his website. “Did I go on CNN and attack the president, nope. Have I said a cross word about the president? Not one time 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.”

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Sessions joins a crowded field vying for the Republican nomination to run against Democratic incumbent Doug Jones next year.

Sessions stepped down as attorney general last year after Trump repeatedly berated Sessions for recusing himself from special counsel Robert Mueller’s investigation of Russian involvement in Trump’s 2016 presidential campaign. Sessions spent 20 years in the Senate before joining the Trump administration and championing the president’s crackdown on illegal immigration.

Sessions’ former colleague, GOP Sen. Richard Shelby, earlier said he would endorse the former attorney general and believes he can win.

“He ought to win that race, but he has to win it on the ground,” Shelby said, insisting that Sessions would be a “formidable candidate.”

Two other former colleagues, Sens. Roy Blunt of Missouri and John Barrasso of Wyoming, told Politico they would endorse Sessions. However, other GOP senators were noncommittal and the National Republican Senatorial Committee will remain neutral, the website reported.

Sessions joins an already crowded field including Rep. Bradley Byrne, former Auburn University football coach Tommy Tuberville, Alabama Secretary of State John Merrill, state Rep. Arnold Mooney and Roy Moore, who lost the special election to replace Sessions to Democrat Doug Jones in 2017.