One of Trump's major political strengths has been his consistent stance, in contradiction to the Republican mainstream, that Social Security, Medicare, and Medicaid should not be cut. That's why he does so much better with lower income voters dependent on those programs than McCain or Romney could. I definitely think voters will turn on him if he changes his mind and cuts them anyway.
One of Trump’s major political facets is that he functions as a sort of rorschach test for supporters to read their own favorite issues and stances into even when they aren’t supported by what he has said. Immigration “he won’t deport the ones I like”, on abortion “he will ban it / he will not ban it”, on the economy “he will lower my taxes / lower the deficit”, and on entitlements “he will protect my social security check / he will curb social security spending by cutting fraud”.
