(This story originally ran on April 17, 2018. It has been updated -- since Donald Trump still has not released his taxes, one year later.)

(CNN) With a midnight Monday deadline for all Americans to file their taxes (or seek an extension), it's a good time to remember this fact: The President of the United States has still never released any detailed -- or un-detailed -- information about his tax returns.

That makes him the only modern president to refuse to do so. He was also the only modern-era major party presidential nominee not to release any sort of tax return information. History!

That historic lack of transparency has not, however, stopped President Donald Trump from pushing into law a major overhaul of the nation's tax structure.

"America's tax code is a total dysfunctional mess," he said at a rally just before Congress passed his tax cuts in 2017. "It is riddled with loopholes that let some special interests, including myself, in all fairness -- it is going to cost me a fortune, this thing. Believe me, believe me, this is not good for me."

It's literally impossible to fact check that statement.

Read More