First they have to establish a link between Trump and the riots. Then they have to prove that the riot was an insurrection.
Neither thing is provable in a sane court because, no matter how much you want to believe it, Trump had absolutely nothing to do with the riot. Also, the riot cannot in anyway be considered an insurrection. The motive was all wrong, they were completely unarmed and it was FBI operatives placed in the crowd by Democrats to instigate the riot. The Capitol police moved the barricades and opened the doors to the Capitol Bldg and let them in.
Trump didn't tell me to believe that, logic and reason did. I don't even like Trump all that much.