Fourteen people were subpoenaed by the House committee investigating the January riot at the U.S. Capitol.
The committee wants information from people who met and submitted false Electoral College certificates in seven states.
The committee said it has received information that groups of people met in the seven states mentioned in the subpoenas and submitted bogus slates of Electoral-College votes for former President Trump.
The fake Electoral College certifications were used by multiple Trump advisors to delay or block the certification of the election during the Joint Session of Congress on January 6th, 2021, according to the committee.
The session was disrupted by a mob of Trump supporters who swarmed through the halls of Congress.
The people subpoenaed by the committee were in charge of the false electors.
Nancy Cottle, chairperson, Arizona; Laurie B. Pellegrino, secretary, Arizona; and David Shafer, chairperson, Georgia.
Bennie Thompson, the Mississippi Democrat who is chairman of the panel, said that the individuals they have subpoenaed have information about how these so-called alternate electors met and who was behind that scheme.
We encourage them to cooperate with the Select Committee's investigation to get answers about January 6th for the American people and ensure nothing like that day ever happens again.
Hundreds of witnesses have been interviewed by the select committee.
Trump lost an effort in federal court to stop the panel from getting more than 700 pages of documents from his time in the White House.
The Supreme Court denied his request.
A spokeswoman for Trump didn't respond to CNBC's request for comment.
CNBC's Kevin Breuninger has additional reporting.
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