
GAZIANTEP, TURKEY - APRIL 01: U2's Bono (right) performs for the kids during a visit to a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U2's Bono (right) performs for the kids during a visit to a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U2's Bono (right) performs for the kids during a visit to a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U2's Bono (right) performs for the kids during a visit to a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U2's Bono (front) performs for the kids during a visit to a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U.S. Senator for South Carolina, Lindsey Graham (left 2) and U2's Bono visit a preschool at a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )

GAZIANTEP, TURKEY - APRIL 01: U.S. Senator for South Carolina, Lindsey Graham (R) and U2's Bono () are seen during a visit to a tent city of Syrian refugees in Nizip district of Turkey's Gaziantep province on April 01, 2016. ( Kerem Kocalar - Anadolu Agency )