The panel will zero in on a pivotal tweet sent by Trump in the early hours of 19 December 2020, according to sources close to the inquiry who spoke on condition of anonymity.
"Big protest in D.C. on January 6th," Trump said in the tweet. "Be there, will be wild!"
The select committee will say at the hearing - led by the US representatives Jamie Raskin and Stephanie Murphy - that Trump's tweet was the catalyst that triggered the Proud Boys and Oath Keepers groups, as well as Stop the Steal activists, to target the certification.
And Trump sent the tweet knowing that for those groups, it amounted to a confirmation that they should put into motion their plans for January 6, the select committee will say, and encouraged thousands of other supporters to also march on the Capitol for a protest.
The tweet was the pivotal moment in the timeline leading up to the Capitol attack, the select committee will say, since it was from that point that the Proud Boys and Oath Keepers seriously started preparations, and Stop the Steal started applying for permits to protest near the Capitol.
The select committee also plans to show video clips today from the former White House counsel Pat Cipollone's testimony to House investigators.
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