US Senator Ron Wyden (D-Oregon) has blocked the reauthorization of the
FISA Amendment Act, legislation that allows the government to conduct
warrantless wiretaps. Although the Obama administration expected the
reauthorization to sail through the legislature, Wyden has taken a
stand to block the bill because the government refuses to disclose
how often the wiretap powers are being used. Wyden has placed a hold
on the legislation, the same type of action he took last year when
he opposed the Protect IP Act (PIPA).
http://www.wired.com/threatlevel/2012/06/fisa-amendments-act-fate/