No it's not, the use of chemical weapons of mass destruction by the US is well documented, in Vietnam, Iraq and now Syria.
"Got any ideas how to get Assad's foreign henchmen out of Syria"
"Hetzbollah exodus would be nice to start with."
No I don't even think about it because its not for you, me or anyone else to decide who Assad invites into Syria to help the Syrians defeat al quaeda and ISIS.