It is well known that Kurt Gödel had doubts concerning the US constitution and believed that it somehow was inconsistent and opened up for a dictatorial grab. 


What was he thinking?



What was Gödel's Constitutional Problem?
The history of how Gödel studied the US constitution in preparation for the citizenship exam is well documented by [Jeffrey Kegler](http://morgenstern.jeffreykegler.com/), as pointed out in the comments. Perhaps more relevant for MO (as opposed to HSM) is what the flaw in mathematical logic might have been that Gödel had noticed in the constitution.


A scholarly account of the latter issue is given in [Gödel's loophole](http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2010183) by Enrique Guerra-Pujol (2012).



> 
> The mathematician and philosopher Kurt Gödel reportedly discovered a
>  deep logical contradiction in the US Constitution. What was it? Although no one knows with certainty of what Gödel’s loophole or “constitutional contradiction” consists, in view of Gödel's research interests it is reasonable to search for a problem of *self-reference*. We will refer to a constitutional design defect as “Gödelian” if the flaw is contained in a constitutional statement that is self-referential.
> 
> 
> 


.



> 
> We have
>  identified one particular “design defect” in the Constitution that
>  qualifies as a “Gödelian” design defect. In summary, Gödel’s loophole
>  is that the amendment procedures set forth in Article V self-apply to
>  the constitutional statements in Article V themselves, including the
>  entrenchment clauses in Article V. Furthermore, not only may Article V
>  itself be amended, but it may also be amended in a downward direction
>  (i.e., through an “anti-entrenchment” amendment making it easier to
>  amend the Constitution). Lastly, the Gödelian problem of
>  self-amendment or anti-entrenchment is unsolvable.
> 
> 
> 


