The United States and its allies will push for "punitive" measures against Tehran due to its weak response to the international offer to persuade it to freeze its nuclear program, White House spokeswoman Dana Perino said Wednesday. "In the absence to a positive response to the generous offer that we provided for our incentives package, we think that the allies will have no choice but to take further measures that would be punitive, given that we don't have a decent and responsive statement from the Iranians," said Perino.