" How about this. Joe takes a drug test, Trump presents his tax returns?"
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How about this. Quit comparing apples to oranges! Let both take a drug test; if Joe isn't on drugs, he should not be concerned. In fact he could get a "leg up" on the president by doing so, and coming out "clean as a whistle" ! He should be eager to take the test, so as to call our president's bluff ! That is, if he's clean...
So far as the tax return issue.. During the Obama administration, Lois Learner was mucking around with many people's tax filings. It appears she was targeting conservative groups with her spiteful chicanery. Is there any reason at all, to suspect that once Donald Trump announced his candidacy, that she didn't start digging into his tax records with a vengeance?
https://www.youtube.com/watch?v=zM_HuDlbquU Personally, I think the president keeps the democrats harping upon the tax returns to serve as a distraction. So long as a flock of them are pursuing his tax returns, they are not quite so likely to make up more ugly lies about him !