Martin Wolf of the FT makes the same constitutional point that was made here. You are not going to contain a man like Trump within a constitution.
So there is a similarity to Roman history and the transition from the Republic to the Empire. Not in all ways. But in this one at least.
http://www.ft.com/intl/cms/s/2/743d91b8-df8d-11e5-b67f-a61732c1d025.html#axzz41qtNRFAF
Disuniting the states in some form would be preferrable to an imperial USA ruled by a Caesar.