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- Former Speaker Kevin McCarthy says he's leaving Congress.
- McCarthy wrote in a Wall Street Journal column that he will resign at the end of the year.
- His departure will further narrow Republicans' slim House majority.
Former House Speaker Kevin McCarthy on Wednesday said that he will leave Congress at the end of the year.
"I have decided to depart the House at the end of this year to serve America in new ways," McCarthy wrote in a Wall Street Journal column. "I know my work is only getting started."