WASHINGTON — Representative Kevin McCarthy, the House Republican leader, has threatened to retaliate against any company that complies with the congressional committee investigating the Jan. 6 riot, after the panel asked dozens of firms to preserve the phone and social media records of 11 far-right members of Congress who pushed to overturn the results of the 2020 election.

Mr. McCarthy’s warning was an escalation of his efforts to thwart a full accounting of the deadly attack at the Capitol carried out by a pro-Trump mob, and his latest attempt to insulate the former president and Republican lawmakers from scrutiny of

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