"The US court of appeals has ruled that the bulk collection of telephone metadata is unlawful, in a landmark decision that clears the way for a full legal challenge against the National Security Agency." See
“The US court of appeals has ruled that the bulk collection of telephone metadata is unlawful, in a landmark decision that clears the way for a full legal challenge against the National Security Agency.”
See the article: NSA mass phone surveillance revealed by Edward Snowden ruled illegal
(The Guardian, link)
And see the full judgment: ACLU v. Clapper
(pdf)