"On the campaign trail, candidate Trump occasionally raised the idea of creating 'safe zones' for Syr..." — Peter Bergen

The sitting prime minister, Jose Aznar, who had strongly backed the U.S.-led Iraq War, was unseated by a challenger who then pulled Spanish troops out of Iraq. The Madrid terrorist attacks are generally regarded as being the key to why Aznar, who had been leading in the polls, was defeated.

Abu Musab al-Suri is someone I got to know pretty well because he's a Syrian. Very bright guy, lived in London. He actually was the person who took myself and correspondent Peter Arnett and the cameraman, Peter Juvenal, to interview bin Laden for his first TV interview.

Trump has long said he favors a 'safe zone' in Syria to prevent Basher al Assad's regime from carrying out indiscriminate airstrikes against Syrian civilians and to halt the refugee flow out of Syria.

When Abu Zubaydah was shown a series of photos of al Qaeda members by Soufan, he identified one of them as the operational commander of 9/11, Khalid Sheikh Mohammed.