McConnell rformally announced his retirement in a Senate floor speech on Thursday

Senator Mitch McConnell will not run for re-election next year, bringing an end to a decades-long career for a Republican leader who marshaled his party through multiple administrations with a singleminded focus on power that enraged his critics and delighted his allies.

The Associated Press broke the news of McConnell’s retirement on Thursday, which marked the Republican senator’s 83rd birthday. McConnell formally announced his retirement in a Senate floor speech on Thursday.