A lot of people don't know that in 2011 the Foreign Intelligence Security Court ruled parts of the surveillance programs illegal, but that decision has never been released to the public or congress. So when people say "it's all legal" they are lying.
Not even congresspeople (Rep. Grayson) who have asked to see key FISC documents have been allowed: (from Glenn Greenwald's Aug. 4 Guardian story):
On June 19, Grayson wrote to the House Intelligence Committee requesting several documents relating to media accounts about the NSA. Included among them were FISA court opinions directing the collection of telephone records for Americans, as well as documents relating to the PRISM program.
But just over four weeks later, the Chairman of the Committee, GOP Rep. Mike Rogers, wrote to Grayson informing him that his requests had been denied by a Committee "voice vote".
In a follow-up email exchange, a staff member for Grayson wrote to the Chairman, advising him that Congressman Grayson had "discussed the committee's decision with Ranking Member [Dutch] Ruppersberger on the floor last night, and he told the Congressman that he was unaware of any committee action on this matter." Grayson wanted to know how a voice vote denying him access to these documents could have taken place without the knowledge of the ranking member on the Committee, and asked: "can you please share with us the recorded vote, Member-by-Member?" The reply from this Committee was as follows:
Thanks for your inquiry. The full Committee attends Business Meetings. At our July 18, 2013 Business Meeting, there were seven Democrat Members and nine Republican Members in attendance. The transcript is classified."