Neither did Obama or Bush or Clinton or Bush or Reagan or Carter.... et cetera, et cetera. Quite frankly, Ross is more qualified than 99.99999% of Americans. This is just Trump saying what every other President has thought.
Again the problem is Trump is suppose to be this "shake up DC" populist an while it was obvious bullsh*t to anyone who isn't his supporters the fact is his supporters still say he is even though he day by day is acting more an more like an establishment shill
"His supporters" say that in the sense that you're talking about his most loyal and rabid and unflinching worshipers like Sanchez. Most of "his supporters," as in people who cast their ballot for him, just wanted a Republican in the White House and could not care less about his "populism."