The House select committee sent letters to three Republican lawmakers asking them to give information about the deadly attack on the Capitol.
The panel wants to know if the lawmaker was involved in planning the events that led to the Capitol riot.
Another letter asked the congressman to discuss his claim that the president asked him to withdraw from the 2020 elections.
The committee sent a letter to Jackson, urging him to get protection because of the text messages sent by the Oath Keepers.
One month before the investigators plan to unveil their findings in a series of public hearings, the committee wants to meet with the lawmakers.
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