Believe it or not, I don't actually mind too much that this is the basis of the tax break. That's a worthwhile discussion to have as a voting public.
But: Trump and the Republican voters need to say that's what they're doing. Instead of saying "Oh, EVERYONE is getting a tax break! Wait until people file their tax returns, then everyone will start believing in Trump!" they need to say "No, no, no, no, we're flattening out the tax code so that more people are paying a higher rate, and then the taxes come down on the wealthiest because they're the ones who have been doing all the paying so far."
Then we can have a discussion on why that's still wrong - but at least that's the right discussion to have, instead of us shouting from the rooftops all day that it was sold deceptively and being ignored.