What chemical warfare? What chlorine gas? What sarin gas? Why the false claims? Why the attack? See;
https://www.zerohedge.com/news/2018-04-17/employee-bombed-syrian-research-site-says-no-chemicals-released-proof-none-existed
Here's Senator Rand Paul's comments; https://www.veteranstoday.com/2018/04/18/us-senator-chemical-attack-used-to-galvanize-the-world-against-assad/