...he's leading the republican agenda...
Incorrect. He's leading the Right half of the Populist agenda that has sprung-up this campaign season.
...which is light years away from being the american agenda...
What is the American Agenda?
Trump is leading the reaction of that portion of the American People which are rebelling against the forcibly imposed Liberal Agenda of the past seven years.
...Many in his own party smell the stink of drumph too Are they all unamerican?? Romney McCain etc etc come to mind
Never said they weren't anti-Trump.
They are.
Establishment Ruling Elites within the Republican Party Old Guard are getting their asses kicked on the campaign trail at the moment.
Vast numbers of Americans, disgusted with the Liberal Agenda, are attempting to brush aside the Old Guard in the Republican Party, and using the shell.