He says that Erbil has long kept its doors open for Christians.
Erbil, the Iraqi Kurdish capital, is home to a U.S. consulate and thousands of U.S. citizens working in the oil industry.
Their harrowing escape to Erbil has ended in a precarious and hardscrabble existence.
The vehicles were approaching Erbil, the capital city of Iraqi Kurdistan, were many U.S. diplomatic and military personnel reside.
Usama is an Iraqi-American currently residing in Erbil, Iraq.
McCain said that ISIS held American-made Howitzer cannons had come within range of Erbil, where U.S. personnel reside.
ISIS forces had come so close to Erbil that the city was in range of the Howitzer artillery cannons that ISIS possesses.