Nations across the Middle East braced for the possibility of a wider war after U.S. strikes on three Iranian nuclear facilities prompted urgent international appeals for diplomacy. Iran is weighing its response and said at an emergency meeting of the U.N. Security Council that it reserved the right to defend itself against “blatant U.S. aggression.” President Donald Trump — who is slated to meet with his national security team Monday afternoon — raised the prospect of regime change in Tehran, contradicting the message of his top officials. He also continued to assert his claims of substantial damage to the nuclear facilities, without providing additional evidence. The International Atomic Energy Agency is still assessing the extent of the damage from the strikes.