After nearly two years of stark divisions over the war in Gaza and support for Israel, Democrats are now finding themselves at odds over U.S. policy toward Iran as progressives demand unified opposition to President Donald Trump's consideration of a strike against Tehran's nuclear program while party leaders tread more cautiously.

Iran’s supreme leader, Ayatollah Ali Khamenei, who crushed internal threats repeatedly during more than three decades in power, now faces his greatest challenge yet. His archenemy, Israel, has secured free rein over Iran’s skies and is decimating the country’s military leadership and nuclear program with its punishing air campaign.