What did U.S. officials have to lose by saying that bin Laden was being protected by the Pakistanis, if it were true?

Mateen pledged allegiance to ISIS during his attack, the worst terror attack on American soil since 9/11.

McMaster, 54, is the smartest and most capable military officer of his generation, one who has not only led American victories on the battlefields of the 1991 Gulf War and of the Iraq War, but also holds a Ph.D. in history.

Trump has claimed he knows more about ISIS than America's leading generals. Clearly, this is also total nonsense; he doesn't seem to have done the slightest thing to educate himself about ISIS.

My quest to meet Osama bin Laden began in North London early in 1997. In the Dollis Hill section, I contacted Khaled al-Fauwaz, the spokesman for a Saudi opposition group, the Advice and Reformation Committee, which bin Laden had founded.

Occasionally, Donald Trump says something that is politically incorrect but which also happens to be true.

ISIS is even at war with its most natural ally, al Qaeda in Syria.

Because 9/11 was carried out by 19 foreign-born Arab hijackers, many assume that all terrorists who attack the West are foreigners.

The money that bin Laden inherited was about 20 million dollars over the course of many years, not the much larger sums some have suggested. In 1994, his family cut him off.

ISIS may be a perversion of Islam, but Islamic it is, just as Christian beliefs about the sanctity of the unborn child explain why some Christian fundamentalists attack abortion clinics and doctors.

And in the end, bin Laden died in a squalid suburban compound surrounded by his wives and children and far from the front lines of his holy war.

Bin Laden was 200 miles away from the area where all of these drone strikes were taking out his key leaders, he was able to indulge in his hobbies... and he was making occasional video tapes and audio tapes to the wider world.

We climbed the stairs to the third floor, where Osama bin Laden died early in the morning of May 2, 2011.

Sheikh Rahman's fatwa was the first time that anyone associated with al Qaeda had given religious sanction to attacks on American aviation, shipping and economic targets.

The Sunni militants that make up ISIS are not the underlying problem in Syria and Iraq, but rather they are a symptom of other deeper problems.

What is tricky for those hoping to utilize such weapons is that TATP bombs are quite difficult to make because their ingredients, when combined, are highly unstable and can explode easily if mishandled.

I've interviewed multiple people who know bin Laden... who tend to have a universal picture of what he's like, which is: modest, retiring, unassuming, kind of thoughtful - lots of things that don't fit with a mass murderer, which he is as well.

Iraqi dictator Saddam Hussein brutally repressed all forms of opposition to his regime, and before the Iraq War, al Qaeda had no presence in Iraq.

The Russians have been waging wars with these separatists since the 19th century, but for obvious reasons, Chechen separatist terrorism tends to be carried out by Chechens.

A decade and a half ago, the U.S. Air Force dropped massive 15,000-pound 'Daisy Cutter' bombs on the Tora Bora complex where Osama bin Laden was hiding in December 2001.

If the CIA and other U.S. intelligence agencies were private companies and were chronically unable to accomplish one of their key missions, their shareholders would have long ago revolted, fired their management, and their stock would be trading at values near zero.

The dangers of TATP bombs can be seen in the case of Matthew Rugo and Curtis Jetton, 21-year-old roommates in Texas City, Texas. They didn't have any bomb-making training and were manufacturing explosives in 2006 from concentrated bleach when their concoction blew up, killing Rugo and injuring Jetton.

Islam is, to be sure, a big tent, and the one and a half billion Muslims in the world run the gamut from mystical, moderate, pacific Sufis to Salafists.

What made al-Awlaki so influential is that, unlike a number of leaders of al Qaeda such as Osama bin Laden, he was a cleric, so he could present himself as a leading religious figure. Second, because al-Awlaki had spent much of his adult life in the States, he communicated with his followers in colloquial, accessible American English.