On the otherhand, Bush allowed the wire tapping (without resort to the FISA court) of communications that involved an extra-territorial component. Personally, I believe that to be entirely permissible in his role as Commander-in-Chief.
"When the Foreign Intelligence Surveillance Act was created in 1978, Attorney General Griffin Bell, testified before the intelligence committee, and he said that the current bill recognizes no inherent power of the President to conduct electronic surveillance. He said, ‘This bill specifically states that the procedures in the bill are the exclusive means by which electronic surveillance may be conducted.’ In other words, what the President is saying is that he has these inherent powers to conduct electronic surveillance, but the whole reason for creating this act, according to the Attorney General at the time, was to prevent the President from using any inherent powers and to use exclusively this act." J. Bamford
The FISA Act was created to be that stop-gap. It was created specifically to address any consequent President from using the very argument that Nixon tried and Bush and this Adminstration have used... all they had to do was get FISA approval (which, again, was a given).. all President Bush had to do was follow the law.
Also... the President admitted to wiretapping domestic-to- domestic calls and intercepts 2 weeks after 9/11. So from roughly Nov 2001- to this disclosure by Bush and the Bush Administration in 2005... you would think that this Administration would have been able to have found the time to have followed Federal Statute and Proceedure? Of all that I have read (not exhaustive by any means) those requests through FISA are hardly ever denied. No one would have denied Bush.
You asked for specific crimes.. President Bush broke federal law. And has already publically admitted it.