If the only tax was a national sales tax, then taxes would be based strictly on consumption instead of accretion of wealth.
I don't understand how this could be seen as anything other than the most, base, vile possible shift toward a regressive tax system.
Is it even possible to conceive of a system of taxation more fundamentally regressive than this? Even if the sales tax is "graduated", this still means there is no tax on capital gains, no tax on dividend or interest income, no tax on corporate profits, no tax on the value of your estate when you die, etc., etc. Each of the ways that rich people stay rich and get richer would be taxed at the rate of zero percent.
It means that the poor, who spend every penny they earn, will be taxed at an astronomically higher rate than the rich, relative to their accretion of wealth.
How could any non-rich person be in favor of an idea like this? I don't care how much you love Jesus, you cannot vote for a guy who openly advocates a return to the gilded age unless . . . you're stupid.