I think that his 9-9-9 plan deserves a much closer look. The first 9 is corporate tax, and I think that at that rate , it's much higher than their current tax on profits only, WHICH IS ULTIMATELY PAID BY CONSUMERS.
The second 9 is personal flatrate income tax, and that is much higher than what is (or is not) paid by the poorest citizens. (I am against the poorest getting a complete free ride or even a negative income tax. ALL should pay something!)
And the third 9 is of course the 9% federal sales tax which is IN ADDITION TO MY 8.25% state+county+city sales tax, equalling 17.25% for myself.
Overall, all three of those taxes add up to about 35.25%.
And BTW, my property taxes are still there, and still rising most years.