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A Turkish catamaran taking the first group of migrants to be sent back to Turkey leave the port of Chios  early on April 4, 2016.  
Greece sent a first wave of migrants back to Turkey on April 4 under an EU deal that has faced heavy criticism from rights groups. Under the agreement, designed to halt the main influx which comes from Turkey, all "irregular migrants" arriving since March 20 face being sent back, although the deal calls for each case to be examined individually. For every Syrian refugee returned, another Syrian refugee will be resettled from Turkey to the EU, with numbers capped at 72,000. / AFP / LOUISA GOULIAMAKI        (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)
A Turkish catamaran taking the first group of migrants to be sent back to Turkey leave the port of Chios  early on April 4, 2016.  
Greece sent a first wave of migrants back to Turkey on April 4 under an EU deal that has faced heavy criticism from rights groups. Under the agreement, designed to halt the main influx which comes from Turkey, all "irregular migrants" arriving since March 20 face being sent back, although the deal calls for each case to be examined individually. For every Syrian refugee returned, another Syrian refugee will be resettled from Turkey to the EU, with numbers capped at 72,000. / AFP / LOUISA GOULIAMAKI        (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)

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William Lacy Swing, director general of the International Organization for Migration, speaks with Christiane Amanpour as migrants are deported from Greece.

IOM: Concerns about 'mechanical quality' of migrant plan

William Lacy Swing, director general of the International Organization for Migration, speaks with Christiane Amanpour as migrants are deported from Greece.