Ivo Daalder, who was U.S. ambassador to NATO during the 2011 military intervention in Libya, says the United States should conduct military strikes against Syria, even if it can't get the backing of the United Nations. He argues that Syrian President Bashar Assad would interpret inaction as an invitation to use chemical weapons in the future. He also says that despite asking for congressional approval for military action, this is ultimately President Obama's call. "This is a lonely place for presidents to be. It will be up to him to make that decision."