many in the tea party about how the process works and how free markets work. Seeing this movement that we were part of creating going off in a direction that's anti-free market, anti-trade and anti-immigrant -- many of us are really saddened by that.' ... Trump flouted the many Republican leaders' desire for a more conciliatory tone on immigration -- and then became the standard bearer for Republican voters who never wanted an unfettered free market in the first place. Trump ignored the many Republicans who criticized him for emboldening fringe white nationalists -- and then became the champion of white voters with racially inflected grievances."

Trump voters didn't like pro-immigration establishment Republican policies, they weren't ideological Republicans, they were waiting for racist right-wing hate radio come to life populist Trump and caught Republicans by surprise: "Trump tapped into beliefs, ideas, and anxieties that were already present and even well-established within the party. His support was hiding in plain site." Anti-immigration was a new thing for Republicans.

From "Identity Crisis"