Sen. Marco Rubio (R-Fla.), vice chair of the Senate Intelligence Committee, said it will be Iran’s “decision to make” whether the Iranian-backed Lebanese militant group Hezbollah retaliates after

Israel's killing of Hezbollah leader Hassan Nasrallah has given Iran a serious dilemma -- how to cope with the loss of a crucial ally and still maintain its regional influence.

Iran’s supreme leader has said the death of Hezbollah leader Hassan Nasrallah "will not go unavenged", a day after he was killed in an Israeli air strike in Lebanon. Ayatollah Ali Khamenei announced five days of mourning in Iran in response to what he described as the "martyrdom of the great Nasrallah",