Prior to the attack, Iran had threatened to retaliate against the U.S. if it became involved in its conflict with Israel.

After nearly two years of stark divisions over the war in Gaza and support for Israel, Democrats seemed at odds over policy toward Iran as progressives demanded unified opposition before President Donald Trump announced U.S. strikes against Tehran’s nuclear program. Party leaders were treading more cautiously.

President Donald Trump announced Saturday evening that US military forces had dropped bombs on three Iranian nuclear facilities, ending a weeklong deliberation period over joining Israel’s campaign against Tehran and thrusting the United States squarely into an escalating Middle East conflict.