Frustrated by Iran's continued defiance of demands to come clean on its nuclear program, the Obama administration is leaning toward imposing new sanctions, even if it must act alone.
Administration officials acknowledged growing concern that there may not be international consensus to expand the existing UN sanctions, despite Teheran's apparent rejection of a confidence-building measure proposed by the UN's nuclear watchdog in hopes of making progress on the nuclear issue.
US Secretary of State Hillary Rodham Clinton said in an interview with CNN on Friday that the administration wants to let the negotiating process "play out."
But White House press secretary Robert Gibbs expressed limited patience with Iran. "The president's time is not unlimited," he said when asked whether it was time to pursue tougher sanctions.