Greenwald says: "Dianne Feinstein is outright lying when she says that she doesn't know of any instances of abuse at the National Security Agency. Leaving aside the fact that there have been several different reports by ABC News, by The New York Times, of the NSA abusing its eavesdropping powers over the last four years, there is a 2011 opinion, 80 pages long, from the FISA court, the secret court that oversees the NSA. And what it ruled, although the court—the opinion is top-secret and hasn't been publicly released. What it ruled is that the way in which the NSA is spying on American citizens is in violation of the Fourth Amendment of the United States Constitution, as well as in excess of the limitations imposed by the statute, the FISA Amendments Act of 2008. In other words, what the NSA is doing is both unconstitutional and illegal.