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TRNOVEC, CROATIA - OCTOBER 19:  Migrants wait in the rain at the Trnovec border crossing as restrictions on movements through have produced bottlenecks on Croatias borders on October 19, 2015 in Trnovec ,Croatia. Slovenian authorities closed the border after reaching their daily quota, leaving over 1000 migrants stranded as hundreds more continue to arrive.  (Photo by Jeff J Mitchell/Getty Images)
TRNOVEC, CROATIA - OCTOBER 19:  Migrants wait in the rain at the Trnovec border crossing as restrictions on movements through have produced bottlenecks on Croatias borders on October 19, 2015 in Trnovec ,Croatia. Slovenian authorities closed the border after reaching their daily quota, leaving over 1000 migrants stranded as hundreds more continue to arrive.  (Photo by Jeff J Mitchell/Getty Images)

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Dimitris Avramopoulos, EU Commissioner for Migration, tells Christiane Amanpour that Europe needs migrants -- "it is in our DNA."