Jared Kushner was questioned before a federal grand jury as prosecutors appeared to be trying to establish if the former president knew his efforts to stay in power were built on a lie.
The move by the G.O.P.-led House was the first in what could be a series of votes seeking to punish those whom Republicans have deemed enemies of the party.
The Justice Department has been gathering evidence about whether the former president and his allies solicited donations with claims of election fraud they knew to be false.