news night station: U.S. has seen evidence of Syria preparing chemical weapons in Idlib: envoy

U.S. has seen evidence of Syria preparing chemical weapons in Idlib: envoy

There is "lots of evidence" that chemical weapons are being prepared by Syrian government forces in Idlib in northwest Syria, the new U.S. adviser for Syria said on Thursday, as he warned of the risks of an offensive on the country's last big rebel enclave.