Many of us consider that as long as the current system of finance of the federal government is in place no real reform is possible and America simply cannot be made great again. Tinkering around the edges with the brackets, or the deductions, or the rate of tax simply rearranges the deck chairs. Fundamental restructuring of the tax system in such a way that it takes fundamental power away from the federal government and the power to extort campaign contributions away from Congress must be enacted or we will simply go down this path and over the cliff.
I don't think Donald Trump is doing anything but tinkering with the edges but I think that Ted Cruz gets it and has more in mind than merely fixing taxes. If you can fix taxes you can fix the country if you don't fix taxes you can't fix the country.
.gov is broken at all levels and one president is not going to fix it.
As far as Cruz goes. Truth be told the flat tax is stillborn. Makes me question his judgment.