This is why we need to continue to send conservatives to Congress. Once the Congress puts this plan into action, we need to make sure that subsequent Congresses won't get the urge to raise ANY of those rates. Of course, one way to do this would be to write into the legislation creating the 9-9-9 plan, that a vote to raise ANY of the three rates would require a 2/3rds vote of BOTH houses. That will slow them down some. ;o)
We also need to make the principle that everyone pays taxes in America and all pay the same rate a matter of national pride and patriotism.
This needs to become the new third rail of politics, such that anyone who stands up and says “let’s go back to letting a lot of people paying taxes and making some people pay more,” that person gets shouted down immediately. Or fired if he is a congresscritter.