The New York Times reports:
Over the last week, Mr. Trump sent word to Mr. Sessions through allies that he would publicly attack him if he ran. And Mr. McConnell recently approached Mr. Trump, asking him whether his feelings about Mr. Sessions might have improved.
The president said he was very much still opposed to Mr. Sessions and would make that clear if he had to, according to a person briefed on the discussions. Several Republican officials thought that had settled the matter — until Mr. Sessions decided to run.
Mr. Sessions’s decision comes just before the Friday deadline to enter the race. While he has massive name recognition, he has less cash on hand in his previous Senate account than Bradley Byrne, a congressman who represents a district near Mobile, public records show — a disadvantage that could prove challenging.