Kentucky Sen. Mitch McConnell ending his tenure as a power broker who championed conservative causes but ultimately ceded ground to the GOP populism of President Trump.

Ky., stepped down as the longest-serving party leader in U.S. history last year, but has continued to face questions about his health and age.

Republican Sen. Mitch McConnell is announcing that he won’t seek reelection next year, ending a decades-long tenure as a power broker who championed conservative causes but ultimately ceded ground to the fierce GOP populism of President Donald Trump.