ISIS has become quite a self-financing terrorist network with their theft of oil, selling it on the black market with their destruction and seizure of antiquities, selling that on the black market, with their taking over Mosul and raiding the banks. They’ve got a source of funding, so I don’t really know. But I know that the — that Saudi individuals have certainly funded other related terrorist groups over time and also of Wahhabi radicalism by kicking out or sending out imams and teachers to set up schools and mosques to preach that particularly harsh brand of Islam. So the Saudis have a lot that they can do to both stop and then to help.

I think that the Saudis have a multiple level of responsibilities, first and foremost, stopping their own citizens from continuing the financing for extremists. And, you know, Saudi financing is still a major source of revenue for terrorist groups inside Syria, inside Iraq elsewhere.

Islam itself is not our adversary. Muslims are peaceful and tolerant people and have nothing whatsoever to do with terrorism. The obsession in some quarters with a "clash of civilizations" or repeating the specific words "radical Islamic terrorism" is not just a distraction, it gives these criminals, these murderers, more standing than they deserve and it actually plays into their hands by alienating partners we need by our side.

Once and for all, the Saudis, the Qataris, and others need to stop their citizens from directly funding extremist organizations, as well as schools and mosques around the world that have set too many young people on a path toward . When it comes to blocking terrorist recruitment, we have to identify the hotspots—the specific neighborhoods and villages, the prisons and schools—where recruitment happens in clusters.

Stemming this tide will require much better coordination and information sharing among countries every step of the way. We should not stop pressing until Turkey, where most foreign fighters cross into Syria, finally locks down its border. The United States and our allies need to know and share the identities of every fighter who has traveled to Syria.

Our efforts will only succeed if the Arabs and Turks step up in a much bigger way. This is their fight and they need to act like it. So far, however, Turkey has been more focused on the Kurds than on countering ISIS. And to be fair, Turkey has a long and painful history with Kurdish terrorist groups. But the threat from ISIS cannot wait. As difficult as it may be, we need to get Turkey to stop bombing Kurdish fighters in Syria who are battling ISIS and become a full partner of our coalition efforts against ISIS. The United States should also work with our Arab partners to get them more invested in the fight against ISIS. At the moment, they are focused in other areas.

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After a major terrorist attack, every society faces a choice between fear and resolve. The world’s great democracies can’t sacrifice our values or turn our backs on those in need. Therefore, we must choose resolve. And we must lead the world to meet this threat.

One of my favorites is Angela Merkel because I think she's been an extraordinary, strong leader during difficult times in Europe, which has obvious implications for the rest of the world and, most particularly, our country... her bravery in the face of the refugee crisis is something that I am impressed by.

You know, to just be grossly generalistic, you could put half of Trump's supporters into what I call the basket of deplorables. Right? The racist, sexist, homophobic, xenophobic, Islamaphobic — you name it. And unfortunately there are people like that.

Mr. Khan, paid the ultimate sacrifice in his family, didn't he. And what has he heard from Donald Trump? Nothing but insults, degrading comments about Muslims, a total misunderstanding of what made our country great, religious freedom, religious liberty. It's enshrined in our Constitution, as Mr. Khan knows, because he's actually read it.

You know, joining a gang is like having a family. It's feeling like you're part of something bigger than yourself. So we're either going to have gangs that murder and rob and do the things that are so destructive to the gang members and to the community. Or, we're going to have positive gangs. We're going to have positive alternatives for young people.