international law to stop an unjust aggressor. the problem cannot be resolved solely through military response. >> reporter: and the very vital need to built interfaith bridges and trust. previous briefly playing alongside the mufti and visiting the museum first built as a church then repurposed as a mosque when the turks conquered constantinople where you will see islamic calligraphy and christian frescos under the same roof symbolic of what the pope is hoping to accomplish. he came to istanbul at the invitation of orthodox leader patriarch bartholomew declaring a common declaration. we -- the human person no longr