A U.S. Capitol Police whistleblower sent a letter to congressional leaders late last month accusing the agency’s two senior leaders of mishandling intelligence surrounding the Jan. 6 riotat the Capitol.

In the letter, obtained by NBC News, the whistleblower accused Sean Gallagher, the acting chief of uniformed operations, and Yogananda Pittman, the assistant chief for protective and intelligence operations, of significant “failures” in the lead-up to and aftermath ofthe attack.

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