McCain: 'Chemical weapons use in Syria no surprise'
26 April 2013 Last updated at 12:51 BST
US Defence Secretary Chuck Hagel told reporters on Thursday that intelligence findings showed the Assad regime had likely used chemical weapons on a "small scale" in Syria.
The US disclosure came in response to a letter from Senator John McCain and others asking for information about chemical weapons in Syria.
Here Mr McCain talks to Newsnight's Jeremy Paxman about the news and what he thinks should happen in response.