Sessions would scramble the already crowded field of Republicans seeking to take on Democratic Sen. Doug Jones, who won a 2017 special election to fill the remainder of Sessions' term and is widely viewed as the most vulnerable senator on the ballot next year.
Sessions served in the Senate for two decades before being tapped by President Donald Trump to lead the Justice Department. The two had a bitter, public falling out over Sessions' decision to recuse himself from the DOJ's investigation into Russian interference in the 2016 election.
Sessions, 72, must decide within days whether to run: Candidates have until Nov. 8 to qualify for the ballot.