Previous gas attack. he is asked, is there credible evidence about sarin gas and chlorine. no, i have not gotot that evidence. i don't have the evidence. what i'm saying is that other groups on the ground, ngos, fighters, have said crn has been used.sa we are looking for evidence. i don't have evidence, credible or uncredible. that was the response from the actual exchange. i don't know -- did you see an agent of putin, too? >> he's saying we don't have assets on the ground and mustard syria. those who have been on the ground and mustard syria, the cw, the united nations, have established rath...