Sen. Jon Tester announced Wednesday that he will run for reelection, a major boost to Senate Democrats defending their majority on a tough map in 2024.

“I am running for re-election so I can keep fighting for Montanans and demand that Washington stand up for our veterans and lower costs,” Tester said in a statement. “Montanans need a fighter holding Washington accountable and I’m running to defend our Montana values.”

The 66-year-old Tester, who is running for a fourth term, will be a top GOP target this cycle. Senate Democrats are also still waiting on whether Sen. Joe Manchin (D-W.Va.), another of the party’s most vulnerable incumbents, will run again.