His crime and only crime was he got elected.
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And worse, he was (gasp!) an outsider who dared to threaten to clean up the corrupt DC Swamp. For that brazen act he must be punished to send a message to future outsiders. This is what happens when you challenge the status quo.
So far Dems have not listed the actual crimes Trump committed (in their eyes) - as Bugs Bunny said: Dey don’t know me do dey?