Mitch McConnell will end his Senate career with his most indelible mark on the nation’s federal courts and the chamber’s judicial confirmation process, a priority that changed the chamber’s rules and solidified a conservative Supreme Court for the foreseeable future.

Sen. Mitch McConnell’s decision not to run for re-election in Kentucky next year opens up his Senate seat for the first time since 1984 — and it is already drawing interest from heavy hitters looking to fill the seat.