Police made one of several arrests at this house in Narre Warren, a suburb of Melbourne, Saturday. Police raided houses in the city's outer eastern suburbs and made several arrests over an alleged attack planned for ANZAC Day. David Crosling/EPA /LANDOV hide caption

itoggle caption David Crosling/EPA /LANDOV

Two teams face off in a debate over the extent of the president's war powers at the latest debate from Intelligence Squared U.S. Samuel LaHoz/Intelligence Squared U.S. hide caption

itoggle caption Samuel LaHoz/Intelligence Squared U.S.

Libyan Prime Minister Ali Zeidan speaks to the media during a news conference in Rabat, Morocco, on Tuesday, where he talked about the U.S. action to nab an al-Qaida operative in Tripoli. Abdeljalil Bounhar/AP hide caption

itoggle caption Abdeljalil Bounhar/AP

President Obama and John Brennan, his top counterterrorism adviser, in the Oval Office on Jan. 4, 2010. Brennan is a key voice about who gets put on the "kill list." Pete Souza/White House hide caption

itoggle caption Pete Souza/White House