Trump has no ideology. The problem with him revolves around his character.
Most of what seems to be ideology from Trump is unvarnished nationalism to the point of nativism. It is an ideology, but not one that fits into a modern left-right categorization. It causes Pubs (and others) to struggle with how they should react to Trump. Ideological conservatives, whether fiscal or social, don't know how to best use their vote now. Governance-oriented Pubs (who when they compromise become "moderate") don't care for nationalist rhetoric, but don't want to hand power to the Dems either. They are stuck, too.
