I think the one about reconnaissance might have been Churchill?
It seems unlikely that Donald Trump ever read a proper book (Playboy doesn't count!), but it seems he saw this somewhere :- a shrewd guy called H L Mencken had a great quote, pre-war, said "Nobody ever went broke underestimating the taste of the American public". [it's a close relative of the "sucker" one, by Barnum].
And as has been said, Twain had loads :-
1) We have the best government that money can buy.
2) I don't like to commit myself about heaven and hell - you see, I have friends in both places.
3) There are lies, damned lies and statistics.