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The problem with the Democrats last try was towards the end it began to look more like a political vendetta, revenge for losing an election.

A major GOP and Fox News talking point. No Democrats actually felt that way. It was a lot more about Mueller's several instances of Obstruction of Justice, that he (a Republican, no less) said Congress could hold Trump accountable for. But Pelosi did not want to charge him with something he can be criminally indicted for next year.