Pennsylvania Treasurer Stacy Garrity, a Republican, announced Monday that she is running for governor, setting the stage for a challenge to Democratic Gov. Josh Shapiro in 2026. The second-term state treasurer,

State GOP leaders are expected to throw their support behind Garrity. Many of them are worried about a second run from state Sen. Doug Mastriano.

Republicans hope Ms. Garrity, the state treasurer, will give them a shot against Gov. Josh Shapiro. But he will be tough to beat, and the Republican field could still be complicated by Doug Mastriano.