DES MOINES, Iowa (AP) — U.S. Sen. Joni Ernst said Tuesday that she will not seek reelection next year, confirming in a video post on social media that she will retire after months of speculation about her plans.

Ernst’s departure opens up a Senate seat in the state known for its long-serving incumbents. Ernst was first elected in 2014 to the open seat previously held by Tom Harkin, a Democrat who served for 30 years. Republican Chuck Grassley, Iowa’s senior U.S. senator, was first elected to the Senate in 1980.

Her announcement Tuesday followed reports last week that she was expected to announce her retirement in September.

It is the second unexpected retirement for Senate Republicans as they work to maintain their majority in the chamber, with Ernst joining Sen. Thom Tillis of North Ca

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