President Obama said the lack of Muslim integration in some areas of Europe is "probably the greatest danger that Europe faces," echoing the warnings of terrorism experts about the link between Islamist terrorism and a lack of assimilation.

He contrasted it with the Muslim-American community that polls show is largely moderate and hostile to Islamist terrorists and their anti-Western themes.

"Our biggest advantage…is that our Muslim populations, they feel themselves to be Americans. And there is this incredible process of immigration and assimilation that is part of our tradition that is probably our greatest strength," Obama said.

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