Mr. Trump is currently considering two actions that would almost certainly require ground action by American or Israeli forces: Taking over Kharg Island, where Iran loads most of the oil it produces onto tankers, and the underground site at Isfahan where it stores most of its 970 pounds of near-bomb-grade nuclear fuel. Mr. Trump told reporters that he was unconcerned that such moves could commit U.S. forces to a Vietnam-like boondoggle in Iran. “I’m really not afraid of that,” he told reporters. “I’m really not afraid of anything.”

Trump Says U.S. Does Not ‘Need or Desire’ Help From Allies on Iran

President Trump has faced mounting criticism over the U.S.-Israeli assault on Iran from allies and even members of his own administration.

By Karoun Demirjian and David E. Sanger

Reporting from Washington