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And you, whose entire argument is "if you've got nothing to hide you've got nothing to fear?" When has that ever been spoken sincerely? Frankly I don't think congressional Democrats and their media mouthpieces have the credibility or integrity to make that kind of demand. We already know there's nothing criminal, as much as you want to pretend that the IRS doesn't know what they're doing there's simply no basis for that in reality. The reality is that it doesn't matter what his returns look like. Even if they are so completely unimpeachable that nothing, not even a narrative like "he isn't as rich as he says and therefore a liar!" or "rich man bad!" will get any traction, it'll just be on to whatever other stupid thing they want to go on about. They won't "eat shit", and they won't look foolish to anyone except the people who already knew they were fools. Again, there is no compelling reason for the administration to do anything but tell them to fuck off.
What drugs are you smoking? Trump said he would put his businesses in a blind trust, put his family members in charge of the trust, then gave them complete access to his administration and to state secrets. He's been accepting bribes through Mar a Lago basically openly for the entire time he's been president.
As for his tax returns, its been confirmed that he was still in talks about a possible Trump tower in Russia during the caimpaign, and its been all but confirmed* that he received a large share of the Russian state oil company as a bribe after the election. Remember,
illegal revenue still has to be included when you file for taxes. So either Trump didn't include his under the table dealings in which case his tax returns are themselves evidence of a crime, OR he did include them and the tax returns are useful for the attempt to investigate Trump. Or he didn't include them and they never happened, in which case they're still useful for the investigation.
This is to say nothing about the fact that Trump and his older subordinates all act like old timey gangsters... see above.
Also, your "if you've got nothing to hide you've got nothing to fear?" defense only applies to things that are normally private. Hiding things that are normally revealed is suspicious, always. Refuse a drug test when you're applying for a job, see how innocent your prospective employer thinks you are.
*because it was in the Steele dossier, which has been repeatedly confirmed as true by journalists and intelligence officials that attempt to verify its claims