John McCain actually said...
one of the reasons why we were not acting more aggressively against Bashar Assad has got to do with this idea--or, in my view, illusion--that once we conclude the nuclear agreement, there will be a whole new relationship with Iran in the Middle East, which, in my conversations with our friends in the Sunni Arab states, scares the heck out of them.
Context
McCain discusses the impact of the nuclear agreement with Iran on U.S. actions in Syria.
05/20/2015