Does the NSA spy on members of Congress?

One of Congress' most vocal critics of US government surveillance is demanding information about whether intelligence agencies spy on members of Congress.

Rep James Sensenbrenner (R-WI), the author of the original Patriot Act, told the Justice Department in a letter he wants a response by March 28 to questions about whether and how intelligence agencies spy on lawmakers.

"It has been over a month and my colleagues and I have not received a response," he wrote to US Deputy Attorney Gen James Cole. Rep Sensenbrenner's letter also addresses recent information provided by Sen Dianne Feinstein (D-CA), chairwoman of the Senate Intelligence Committee.