The White House said Wednesday it was skeptical about top Iranian officials' comments welcoming a US-backed reward package aimed at ending the dispute over Tehran's nuclear program. "If they were serious about wanting to take us up on that offer, then that would be welcome. But I think we have every reason to be skeptical since we get mixed messages from them quite often," said spokeswoman Dana Perino. "The best way for us to respond to it is to say that we'll see," she said.