Trumpism is a movement by those who want the government to continue the social programs and who believe the lies that "immigrants are taking their jobs", have a xenophobic attitude towards Muslims and Hispanics, and have generally a centrist to conservative view on social issues. These are the people who have been reluctantly voting for the GOP for years only because of social issues. Trump has exposed the disconnect between them and the leadership of the GOP.
While I dislike defending
TrumpMiller or his supporters at all, I suspect some of them are upset not because "immigrants are taking their jobs" but rather "corporations are shipping their jobs to Mexico/China/etc".