Trial Memorandum of the United States House of Representatives in the Impeachment Trial of President Donald J. Trump [February 2, 2021] [open pdf - 690KB]
From the Introduction: "This trial arises from President Donald J. Trump's incitement of insurrection against the Republic he swore to protect. The House of Representatives has impeached him for that constitutional offense. To protect our democracy and national security--and to deter any future President who would consider provoking violence in pursuit of power--the Senate should convict President Trump and disqualify him from future federal officeholding. On January 6, 2021, with Vice President Michael Pence presiding, Congress assembled to perform one of its most solemn constitutional responsibilities: the counting of electoral votes for President of the United States. This ritual has marked the peaceful transfer of power in the United States for centuries. Since the dawn of the Republic, no enemy--foreign or domestic--had ever obstructed Congress's counting of the votes. No President had ever refused to accept an election result or defied the lawful processes for resolving electoral disputes. Until President Trump. In a grievous betrayal of his Oath of Office, President Trump incited a violent mob to attack the United States Capitol during the Joint Session, thus impeding Congress's confirmation of Joseph R. Biden, Jr. as the winner of the presidential election."
U.S. House Committee on the Judiciary: https://judiciary.house.gov/