The ultimate success of the U.S. and Israeli strikes, and so Trump's decision to intervene militarily, depends on how Iran chooses to react. Some analysts fear this action will accelerate Iranian efforts to build a nuclear weapon, with hardliners in Tehran now viewing it as an urgent priority.

The U.S. bombing of Iran's key Fordow nuclear site has "seriously and heavily damaged" the facility, Iranian Foreign Minister Abbas Araqchi said in an interview with CBS News. "No one exactly knows what has transpired in Fordow.