During a McCain campaign conference call with the media, former GOP presidential candidate Rudy Giuliani attacked Obama foreign policy adviser Daniel Kurtzer, who met with Syria's foreign minister last month. Kurtzer told the New York Sun that "None of us thought we were being used or abused [by the Syrian regime]. But we will see over time."

Negotiations should only occur "when you have confidence that you're not being used," Giuliani said. "Maybe this is a playing-out of [Obama's] negotiating with dictators without precondition."