Patrick Leahy, longest serving US senator still in office, announces he won't seek reelection

Leahy, 81, is the fourth longest serving senator in US history. As Senate president pro tempore, he is currently third in the line of presidential succession, following the vice president and speaker of the House.

source https://www.cnn.com/2021/11/15/politics/patrick-leahy-retirement-announcement/index.html