http://www.nytimes.com/2007/01/26/washington/26nsa.html?pagewanted=1&ei=5094&en=9044950dc6386d92&hp&ex=1169874000&partner=homepage

The Bush administration has employed extraordinary
secrecy in defending the National Security Agency's
highly classified domestic surveillance program from
civil lawsuits. Plaintiffs and judges' clerks cannot
see its secret filings. Judges have to make
appointments to review them and are not allowed to
keep copies.

...

A federal district judge in the case, Garr M. King,
invoked another book after a government lawyer refused
to disclose whether he had a certain security
clearance, saying information about the clearance was
itself classified.

"Frankly, your response," Judge King said, "is kind of
an Alice in Wonderland response."