Much ink has been spilled recently over whether Donald Trump is the logical result of Republican ideology, its complete negation, or something else. As with many things, it depends on individual issues and your point of view.
As to his style, Trump has a perfect understanding of the GOP electorate’s clamor for swagger. He swaggers better than any Republican in my memory. He makes Chris Christie look like a shrinking violet. In that sense, he is the very personification of the GOP.
He also learned from the 2012 primary season that nothing arouses the ire of the reactionary masses more than illegal immigration, and that it is impossible to take too hard a line on that point, regardless of whether it makes sense or not. Here again, his views are an accurate reflection of those of his constituents.
On other issues, he is all over the place. My guess is that the drip-drip-dripping of negative ads from the other candidates on these issues will ultimately erode and then destroy his candidacy. That will take time and the expenditure of untold millions of dollars, however.