-Messenger photo by Chad Thompson
U.S. Sen. Chuck Grassley, R-Iowa, speaks to a crowd gathered at the Greater Fort Dodge Growth Alliance on June 29. Grassley has announced he will seek reelection.

DES MOINES, Iowa (AP) — Iowa Sen. Chuck Grassley, the longest-serving Republican senator, said Friday that he will seek an eighth term in 2022, giving the party more confidence in holding the seat as they fight to overtake Democrats’ one-vote margin.

The senator, who turned 88 this month and has held the seat for 40 years, said in an announcement posted on Twitter that there is “a lot more to do, for Iowa.”