A powerful American bunker-busting bomb is the only weapon capable of destroying Iran's deeply buried nuclear facilities, making it President Donald Trump's weapon of choice if he chooses to militarily back Israel.

The GBU-57, a 30,000-pound (13,607 kg) warhead capable of penetrating 200 feet (61 meters) underground before exploding, is missing from Israel's arsenal despite its stated goal of preventing Iran from building a nuclear bomb.

- Why this bomb? -

In less than a week, the Israeli army has taken out Iranian military commanders and damaged numerous surface installations, raising more questions than answers.

"The regime's missile stockpiles, launchers, military bases, production facilities, nuclear scientists, military command and control has taken a very severe beating," said Behnam Ben Taleblu, director of the Iran program at the Washington-based think tank Foundation for Defense of Democracies (FDD), a conservative-leaning group.

"But there are still outsized........

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