Trump has a long history of accusing others of precisely what he is doing or planning. Predicting his next move based on his psychological tell was an amusing game before the pattern became too obvious. He accuses democrats of trying to steal an election because he is trying to steal an election.
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“Put up or shut up” is right. Trump talks a big game but so far his actual legal claims are unimpressive. His biggest in court claim is not widespread fraud, but that Pennsylvania should invalidate all mail in ballots because it violates equal protection. Honestly, his lawyers should be sanctioned for making frivolous claims.