Clouds of smoke rose over Beirut’s southern suburbs as Israel escalated its bombardment of the Lebanese capital.
US Democratic senator Mark Warner says there was no “imminent threat” from Iran to the US.
Senior US Republican Mike Johnson told reporters the US had to attack Iran to protect US interests.
Israeli attacks on Lebanon have killed more than 50 people. It says the strikes are a response to Hezbollah rockets.
An unexploded US kamikaze drone was found on farmland in Western Iraq on Monday.
Tehran's historic Golestan Palace, a UNESCO World Heritage site, has sustained major damage after US-Israeli strikes.
US First Lady Melania Trump has presided over a UN Security Council meeting focusing on children in conflict.
‘What is needed now in the region more than anything, is a way out.’
Marco Rubio has tried to justify the coordinated attacks with Israel on Iran since Saturday as driven by self-defence.
Missiles were seen over Israel after the Israeli military said it had identified a new wave launched from Iran.