Steven Mnuchin, the Treasury secretary, has been lying for months about Republican tax plans. Mnuchin has repeatedly claimed the existence of a Treasury report that — unlike every independent, nonpartisan assessment — found that these plans would pay for themselves, increasing growth and hence revenues so much that the deficit wouldn’t rise. But there is no such report, and never has been; Treasury staffers weren’t even asked to study the issue. Mnuchin said his department had a study showing great effects on growth; that was a lie. Donald Trump says the bill is “not good for me”; that’s a lie. Senator John Cornyn said, “This is not a bill that is designed primarily to benefit the wealthy and the large businesses”; that was a lie. Senator Bob Corker said he wouldn’t support a plan “adding one penny to the deficit”; that was a lie.