Representative Mike Gallagher, Republican of Wisconsin, announced on Saturday that he would not run for re-election, just days after breaking with his party to cast a decisive vote against impeachment charges for Alejandro N. Mayorkas, the homeland security secretary.

Mr. Gallagher, who is in his fourth congressional term, is joining dozens of other lawmakers who have decided to call it quits. But the timing of his decision was striking nonetheless, coming on the heels of his impeachment vote…


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