U.S. Sen. Richard C. Shelby of Alabama, the Senate’s fourth most senior member, has told confidantes that he does not intend to run for reelection next year — prompting some Republicans to urge the powerful, establishment politician to reconsider, even as potential replacements prepare to run for his seat.

The senator in recent weeks told one close Alabama ally that he was not planning on running in 2022 for what would be his seventh term, according to the ally, who was not authorized to discuss the matter and spoke with The Associated Press on condition of anonymity. The person said some in the state were still trying to get Shelby to change his mind out of concern about losing clout and worries that the senator might be replaced by a fringe candidate who would not be as effective.