Key Democratic lawmakers are pressing telephone companies to disclose how they shared Americans’ calling and Internet data with the government, part of an inquiry into domestic surveillance efforts such as the National Security Agency’s warrantless wiretapping program.The House Energy and Commerce Committee, which has jurisdiction over the telecom industry, yesterday sent letters to three major carriers, AT&T, Qwest and Verizon, posing questions aimed at understanding what consumer information is being shared with the government.”Congress has a duty to inquire about whether [the government surveillance program] violates the Constitution, as well as consumer protection and privacy laws,” said Chairman John D. Dingell (D-Mich.).
http://www.washingtonpost.com/wp-dyn/content/article/2007/10/02/AR2007100202332.htmlAlso see:

ACLU Asks Supremes to Let Anti-NSA Spying Case Continue

The ACLU asked the Supreme Court Wednesday to allow journalists and lawyers challenging the government’s warrantless spying program to have their day in court even though they can not prove they were targeted by the nation’s spooks.
http://blog.wired.com/27bstroke6/2007/10/aclu-asks-supre.html