Ah oh, what did he say?
A few months or so ago he made some questionable statements (in reference to our First Amendment), about the Koran being burnt as protest here in America.
There was some discussion about it here.
http://www.freerepublic.com/focus/f-chat/2590970/posts
http://www.freerepublic.com/focus/f-news/2699019/posts
There were other posts, mostly around the time of the second link above - just use ‘Petraeus’ as keyword to search.