Mr. Raskin, who is in line to become the top Democrat on the Judiciary Committee next year, also called on the Trump transition team to disclose contracts it has with private companies vetting its candidates and documents related to its internal investigations into any improper conduct that occurred during the selection of nominees.

Trump has been a vocal critic of tech companies, and he signaled earlier this month that he won't shy away from antitrust enforcement. The incoming president nominated Gail Slater, who advised Trump on tech policy during his first term, to head the Department of Justice's antitrust arm.

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