If the people who voted for Trump in states that Trump won perceive that Trump's policies are costing them money, it's over. Americans know intuitively when they have less money than they had before. Every social issue out there takes second chair to Americans' pocketbooks. If #taxcuts become #faketaxcuts, Trump is mortally wounded. The Democrats won't even have to lie in their campaign ads.
Ideally, tax cuts are supposed to be achieved by a reduction in government spending, not by making winners and losers from certain brackets of taxpayers. That's what Obamacare did.
There sure seem to be a lot of people, myself included, who are growing concerned that the GOP's tax cuts might result in less money in our wallets than we had under Obama and the Democrats.
Americans will know if they were doing better when they see businesses returning from overseas. Unemployment will drop, jobs will be abundant, and opportunities will expand.