People lay flowers Friday near the seafront in Nice in tribute to victims of Thursday's truck attack that killed more than 80 people. France has suffered three major terrorist attacks since 2015 and appears as vulnerable as any Western nation. Clément Mahoudeau/IP3/Getty Images hide caption

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The president of the commission of inquiry, former judge Georges Fenech (center left) and Socialist lawmaker Sebastien Pietrasanta (center right) look on during a press conference in Paris on Tuesday to present the conclusions of French inquiry into the terror attacks that rocked Paris in 2015. Dominique Faget/AFP/Getty Images hide caption

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Policemen search passengers at the entrance of the De Brouckere metro station in Brussels on March 24, two days after the terrorist attack on the city. PHILIPPE HUGUEN/AFP/Getty Images hide caption

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PHILIPPE HUGUEN/AFP/Getty Images

Investigation Continues As Brussels Recovers From Terror Attacks

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President Barack Obama responds to questions on Russia's intervention in Syria during a news conference in the State Dining Room of the White House, October 2, 2015, in Washington, D.C. Mike Theiler /UPI /Landov hide caption

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Mike Theiler /UPI /Landov

When It Comes To Counterterrorism, Why Bush And Obama Aren't So Far Apart

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Members of the Minneapolis Somali community waited in May to enter the U.S. Courthouse where a federal judge ordered four Minnesota men, accused of trying to travel to Syria to join ISIS, to be held pending trial. Jim Mone/AP hide caption

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Jim Mone/AP

Minneapolis Unveiling Plan To Counter Recruiting By ISIS

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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

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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

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Samuel LaHoz/Intelligence Squared U.S.

Debate: Has The President Exceeded His War Powers Authority?

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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

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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

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Pete Souza/White House

A 'Macabre' Process: Nominating Terrorists To Nation's 'Kill List'

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