The six-member Gulf Cooperation Council is expected to form an unprecedented, NATO-inspired joint military command. The growing strength of ISIS and Iran's influence have made cooperation more urgent.
In a statement, Paula and Ed Kassig remembered their 26-year-old son, Peter Kassig, also known as Abdul-Rahman Kassig, as both a realist and an idealist. Kassig was killed by the Islamic State group.
The comments were made to a House panel by Army Gen. Martin Dempsey. Earlier, Defense Secretary Chuck Hagel said the battle against Islamic State militants would be "long and difficult."
Activists say militants are holding hundreds, perhaps thousands of Yazidi women in northern Iraq. The women make contact through secret phones; some men have been killed or beaten trying to save them.
Last month, ISIS terrorized a village, slaughtering the men and kidnapping the young women to force into marriages. On young woman's sisters gave her the courage to escape.
Many legal scholars say the White House lacks a legal justification for the strikes inside Syria. But the administration disagrees, saying its actions are covered by post-Sept. 11 legislation.
The group, which was targeted by U.S. airstrikes in Syria last night, has been on the U.S. radar for a while. Intelligence officials say they have tracked its individual members for years.