Representative Mark Green, the chairman of the Homeland Security Committee, announced he would retire from Congress, adding to the number of powerful G.O.P. chairmen who will not return.

Representative Mark Green, the chairman of the Homeland Security Committee, announced on Wednesday that he would not run for re-election, just a day after the Tennessee Republican oversaw the impeachment of Alejandro N. Mayorkas, the homeland security secretary.

Mr. Green, a deeply conservative former Army Ranger medic who was elected in 2018, said that he had accomplished what he had come to Washington to do.

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Mr. Green, 59, is the third committee chairman who would have been eligible to lead their panel next year to say they will leave Congress at the end of the year. Also this week, Representatives Cathy McMorris Rodgers of Washington, 54, the chairwoman of the Energy and Commerce Committee, and Mike Gallagher of Wisconsin, 39, who heads the select committee on China, announced they would not run for re-election.

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