Dempsey confounded some Israeli leaders in August when he told reporters the United States did not want to be “complicit” in an Israeli attack on Iran.

He also warned that go-it-alone military action risked unraveling an international coalition that has applied progressively stiff sanctions on Iran, which insists that its ambitious nuclear project is purely peaceful.

An Iranian military commander said last month the Islamic Republic would make no distinction between U.S. and Israeli interests and will retaliate against both countries if attacked.

Israeli Prime Minister Benjamin Netanyahu has been pushing the United States to set Iran an ultimatum or risk seeing Israel launch unilateral strikes. Washington says it will not allow Tehran to obtain nuclear weapons, but has not set out its own red lines.