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TOVARNIK, CROATIA - SEPTEMBER 19:  Migrants seek shade from the sun as they  wait at Tovarnik for transport to take them north despite moves by Slovenia and Hungary to hold them back on September on September 19, 2015 in Tovarnik, Croatia.Thousands of migrants are trying back roads and tracks through villages to gain access to Slovenia and the EU since Hungary fenced off its border with Serbia earlier this week.  (Photo by Jeff J Mitchell/Getty Images)
TOVARNIK, CROATIA - SEPTEMBER 19:  Migrants seek shade from the sun as they  wait at Tovarnik for transport to take them north despite moves by Slovenia and Hungary to hold them back on September on September 19, 2015 in Tovarnik, Croatia.Thousands of migrants are trying back roads and tracks through villages to gain access to Slovenia and the EU since Hungary fenced off its border with Serbia earlier this week.  (Photo by Jeff J Mitchell/Getty Images)

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Joel Millman of the International Organization for Migration discusses Europe's growing migrant crisis.

The future of migrants

Joel Millman of the International Organization for Migration discusses Europe's growing migrant crisis.