Both Dems & Pubs are financed and supported by both Wall Street and the Chamber of Commerce. This keeps both of their pockets full along with a hefty retirement.
Trump on the other hand has been successful on Main Street.
IOW’s his business savvy is in the brick and mortar or real business with workers, P&L's and heavy govt regulations.
Trumps speaking truth scares them because it would upset their apple cart.
IOW’s it would bust their coalition.
It wouldn't be hard to connect all of these dots and get most of your questions answered. This would be a good place to start.
While not word for word, that was basically my take on it also.