Source for what? It's no big secret that Perle could not obtain a high-level security clearance for the Pentagon. At the very least (in addition to the FBI investigation into his work as a member of Scoop Jackson's senate staff in the 1970s), his status as a dual citizen of the U.S. and Israel renders him incapable of obtaining such a clearance.
Lol. Gotcha. So, basically, all you can deliver is the fact that a dual Israeli/US citizenship will hold you from certain clearances. This is true, of course. It is a DoD policy that has nothing to do with Israel - you'll get the same result if you're a dual Irish/US citizen, for example.
But I take it that specifically a dual Israeli/US citizenship is what drove you into this convulsion:
If you really want to see how disgraceful this man's role in the Bush administration is, consider this
Just for a laugh: are you a US citizen, a Canadian citizen, or a dual?