The Moroccan-born Muslim mayor of Rotterdam, the Netherlands, told CNN's Michael Holmes on Wednesday that Europe has no place for extremists who are not willing to live within the bounds of its norms.

"You are not forced to be with us, it's a choice," Ahmed Aboutaleb said. "Work with us together to construct a 'we society.'"

"But if you want to stand out of the 'we community,' you threaten us, you go to Yemen to learn how to use a Kalashnikov and to come back to threaten the society, well you are not part of my 'we society,' you better leave."

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