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The September 11, 2001, attacks on the World Trade Center and the Pentagon prompted a fundamental shift in the American government's approach to Islamic terrorism.

I think the forms of terrorism are becoming very diverse, amongst them cyber-terrorism, for example.

Terror threats to the U.S. homeland have reached unprecedented levels.

We live in a world where terror has become a too familiar part of our vocabulary. The terror of 9/11, in which al-Qaeda's attacks on America launched the nation into three wars - against Iraq, Afghanistan, and the Islamic State.

September 11 awoke us to the threat of terrorism. It was forever bookmarked in our history as the day when life as Americans knew it, changed forever.

The atmosphere is different in Congress after September 11. Terrorism is no longer an abstract issue, but a real, tangible threat.

Less about politics, 'The Path to 9/11' focused on the emergence of radical Islamic terror as a clear and present American threat.

Part of this new world of completely improvisational terrorism is that there were codes of war that disintegrated in the face of terrorism.

We are familiar with terrorism. But indiscriminate, cross-border, religiously motivated terrorism is new.

There are two kinds of terrorism. Rational terrorism such as Palestinian terrorism and apocalyptic terrorism like Sept. 11. You have to distinguish between the two.