Robinson’s not the first person to make this claim today.

ANDREA MITCHELL: He is an angry commander in chief. He is not backing down. It’s clear, though, that they are reluctant to go after the safe haven in Syria because they know that that may well be where other western and American hostages are being held.

ROBINSON: But it’s also clear that the airstrikes are having an impact on ISIS or they wouldn’t be doing this. They wouldn’t be doing these dramatic and terroristic acts if they weren’t hurting. I think it’s had a real impact on them.