“My phone contains info about my legislative and political activities, and personal/private discussions with my wife, family, constituents and friends. None of this is the government’s business,” Mr. Perry said. “As with President Trump last night, D.O.J. chose this unnecessary and aggressive action instead of simply contacting my attorneys. These kinds of banana republic tactics should concern every citizen.”

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It was not immediately clear why the F.B.I. had seized Mr. Perry’s phone. A spokeswoman for the congressman did not respond right away to a follow-up question, and the Justice Department did not immediately respond to a request for comment.