U.S. Sen. Mitch McConnell, the longest-serving sitting senator, has announced he will leave Congress at the end of his term. What to know.

Republican Mitch McConnell, a shrewd political tactician who tilted the Supreme Court to the right but whose traditional brand of conservatism was overtaken by Donald Trump’s populism, announced he won’t seek reelection to the US Senate in 2026.

Longtime Kentucky Sen. Mitch McConnell announced Thursday he won’t seek reelection in 2026, ending his run as one of the most powerful lawmakers in the U.S. McConnell, a Republican first elected in 1984, is the longest-serving Senate party leader in U.S. history. He plans to serve out the remainder of his term until it ends in 2027.