I'm still plowing my way through the declassified FISA court ruling from 2011 that found one of the NSA's surveillance programs unconstitutional. However, the gist of the opinion is that NSA had misled the court about whether U.S. persons could be caught up in the program's dragnet, and the court was not happy about it. According to a footnote, it represented "the third instance in less than three years" in which a program had been misrepresented to the court. One of the other two instances is described below. The third one is redacted.
President Obama says he's eager to have a national conversation about the NSA's surveillance programs. I assume, then, that he'll order the declassification of the other two FISA court opinions which found "substantial misrepresentations" by the NSA.