Democratic Sen. Gary Peters of Michigan announced Tuesday that he will not seek reelection in 2026, leaving Congress at the end of his second term and opening up a highly competitive battleground Senate seat.

They will need to defend an open seat in a battleground state that President Trump carried in 2024. And Gov. Gretchen Whitmer ruled out a run.

Democratic Michigan Senator Gary Peters has announced he will not seek a third term in 2026, giving Republicans a top target in a state likely to become a major midterm battleground. Peters, who won reelection in 2020 by a narrow margin of less than 2 points, surprised many with his decision.

Democrat Gary Peters' announcement means Michigan will have an open U.S. Senate seat for the second time in two years.

Democratic Sen. Gary Peters won’t seek reelection in 2026, kicking off what could be a crowded primary to replace him in the battleground state of Michigan. Peters, 66, told The Detroit News that it is time for a “new chapter” that focuses on spending more time with his family.

Democratic Michigan Sen. Gary Peters says he will not seek a third term in 2026, creating a highly contested battleground seat (AP video: Mike Householder)

Michigan Sen. Gary Peters announces he won't run for reelection in 2026, prompting speculation on his replacement, with Pete Buttigieg as a potential candidate.

LANSING, Mich. (AP) — Michigan Sen. Gary Peters, who led the Democrats' Senate campaign efforts the past two election cycles, has announced he will not seek a third term in 2026, creating a highly contested battleground seat expected to be coveted by both parties.

U.S. Sen. Gary Peters announced this week he will not seek reelection, setting the stage for a potentially crowded 2026 race.

After Sen. Gary Peters' surprise announcement, Michigan Republicans are hoping for their first Senate win in the 21st century.

Michigan Democrat Gary Peters won’t be the only senator to retire this cycle, at least according to almost a century of history.