LOUISVILLE, Ky. (AP) — Republican Sen. Mitch McConnell is announcing on Thursday that he won’t seek reelection next year, ending a decadeslong tenure as a power broker who championed conservative causes but ultimately ceded ground to the fierce GOP populism of President Donald Trump. McConnell, the longest-serving Senate party leader in U.S. history, chose his 83rd birthday to share his decision not to run for another term in Kentucky and to retire when his current term ends. He informed The Associated Press of his decision before he was set to address colleagues in a speech on the Senate floor. His announcement begins the epilogue of a storied career as a master strategist, one in which he helped forge a conservative Supreme Court and steered the Senate through tax cuts, presidential impeachment trials and fierce political fights. “Seven times, my fellow Kentuckians have sent me to the Senate,” McConnell said in prepared remarks provided in advance to the AP. “Every day in between I’ve been humbled by the trust they’ve placed in me to do their business here. Representing our commonwealth has been the honor of a lifetime. I will not seek this honor an eighth time. My current term in the Senate will be my last.” McConnell, first elected in 1984, intends to serve the remainder of his term ending in January 2027. The Kentuckian has dealt with a series of medical episodes in recent years, including injuries sustained from falls and times when his face briefly froze while he was speaking. The senator plans to deliver his speech in a chamber the famously taciturn McConnell revered as a young intern long before joining its back benches as a freshman lawmaker in the mid-1980s. His dramatic announcement comes almost a year after his decision to relinquish his leadership post after the November 2024 election. South Dakota Sen. John Thune, a top McConnell deputy, replaced him as majority leader. McConnell’s looming departure reflects the changing dynamics of the Trump-led GOP. He’s seen his power diminish on a parallel track with both his health and his relationship with Trump, who once praised him as an ally but has taken to criticizing him in caustic terms.