"I cannot imagine a more ‘indiscriminate’ and ‘arbitrary’ invasion than this systematic and high-tech collection and retention of personal data on virtually every single citizen..."

"... for purposes of querying and analyzing it without prior judicial approval... Surely, such a program infringes on ‘that degree of privacy’ that the founders enshrined in the Fourth Amendment."

Wrote Federal District Judge Richard J. Leon, a Bush appointee, in a case brought by Larry Klayman, a conservative activist, who is seeking to represent a class of all Americans.

Similar legal challenges to the N.S.A. program, including by the American Civil Liberties Union and the advocacy group Electronic Frontier Foundation, are at earlier stages in the courts. Last month, the Supreme Court declined to hear an unusual challenge to the program by the Electronic Privacy Information Center, which had sought to bypass lower courts.

ADDED: Orin Kerr has some sharp analysis:

Judge Leon’s first and most fundamental move is to distinguish Smith v. Maryland, the 1979 case ruling that the Fourth Amendment does not protect numbers dialed from a telephone. I found Judge Leon’s argument on this point not only unpersuasive, but quite plainly so. I realize that a district court judge can’t just announce that he thinks a Supreme Court decision was wrongly decided. But there are plausible ways to write an opinion distinguishing Smith and implausible ways to do so, and Judge Leon’s opinion struck me as a surprisingly weak effort.

Read the rest at the link.