In a statement, Sessions took pains to signal that he had remained loyal to the president despite their differences. “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,” the statement said. “I was his strongest advocate. I still am. We must make America great again.”

The announcement came after several weeks of public leaks and private maneuvering during which the former attorney general tested the waters about running for what would be his fifth term in the Senate. He gave up his seat in 2017 after Trump nominated him and the Senate confirmed him.

But their relationship soon soured as Sessions, an adviser to Trump’s first presidential campaign, decided to recuse himself from overseeing the Justice Department’s investigation into whether Trump and his associates worked illegally with Russians to interfere in the 2016 election. Trump has never forgiven Sessions, who was the first member of the Senate to endorse his presidential bid.

In his first televised interview since leaving office, Sessions told Fox News’ Tucker Carlson on Thursday that he had no regrets about the recusal. “I did the thing I had to do under the rules of the Department of Justice,” he said, acknowledging, “I know how painful this was for the president.” He added that he has not yet spoken with Trump about his Senate campaign but hopes to.

Trump’s dislike could make for a rough road ahead for Sessions: Republicans who find themselves in Trump’s political cross hairs rarely fare well with their party’s voters. And the president has sent word to the former attorney general through allies that he would publicly attack him if he went ahead with the campaign.

But Sessions, 72, has been an admired figure in Alabama Republican politics for four decades and, by many accounts, remains popular there despite the withering scorn Trump has leveled at him. Among other insults, Trump has accused Sessions of betrayal and of being a “total joke” of a leader at the Justice Department. More recently, the president has referred to him as a “jerk” in private conversations.

On the issues, at least, there are few Republicans who are as committed to Trump’s approach. Sessions was often a lone voice in the Senate arguing to restrict immigration and rescind global free trade agreements. His opposition to immigration reform, in fact, came years before Trump’s conversion on the issue.

In his Fox interview Thursday night, Sessions tried to remind people that he was a true believer in these policies long before Trump’s 2016 campaign. “I was for this agenda before President Trump announced.”

Sessions did not undertake the decision to run again lightly. He sought out advice on the race from dozens of friends and associates in Alabama, Washington and beyond in recent weeks. He commissioned polling to test how strong a contender he would be in a Republican primary that is already quite crowded with well known names. The numbers came back indicating that the race was winnable, according to one person who is close to him.

Alabama Republicans have a history of voting their will — regardless of what Trump tells them to do. Two years ago during the special election to fill Sessions’ old seat, Trump endorsed Luther Strange, the Republican leadership’s preferred candidate. Strange lost the primary to Roy Moore, the former state chief judge who has a large following among religious conservatives there.

In the general election, Trump endorsed Moore and stood by him even after several women came forward to say that the judge had touched them inappropriately when they were teenagers. Moore lost the race to Sen. Doug Jones, who is the first Democrat to represent Alabama in the Senate in a generation.

The prospect of another divisive primary is making many Republicans nervous that Jones could be re-elected, which would imperil the party’s ability to keep its Senate majority. Moore is running again and announced his bid in June. Two other candidates also appear to be formidable: Rep. Bradley Byrne, whose district is near Mobile; and Tommy Tuberville, the former Auburn University football coach.

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