He summoned a mob, some of whom were armed, in the weeks before J6, telling them the election was stolen. He was inviting them to something called the 'stop the steal' rally. People attending knew beforehand the plan was to march on the Capitol, and this just happened to be on the day Congress was certifying the election results. In the midst of breaking into the Capitol, he tweeted that he loved them. Now it's time for your block.
https://apnews.com/article/jan-6-committee-final-report-trump-bcfea6162fe9cfa0d120e86d069af0e4