President Donald Trump is weighing whether to order the U.S. military to get directly involved in Israel’s war against Iran, though experts warn it is unclear if the United States’s most powerful bomb would be capable of destroying Iran’s most hardened nuclear enrichment facility.

Israel strikes Iran's nuclear facilities, but an expert cautions that the heavily protected Fordow site remains a dangerous threat that only U.S. military capabilities can neutralize.

The U.S. is considering targeting Iran's uranium enrichment facility at Fordo, five sources familiar with the matter told CBS News.

An Israeli official said that "there's never a 100 percent guarantee," but "a nuclear disaster" should "not happen."

If the U.S. decides to support Israel more directly in its attack on Iran, one option for Washington would be to provide the “bunker-buster” bombs believed necessary to significantly damage the Fordo nuclear fuel enrichment plant,

Israel has escalated its bombardment of Iranian cities, including Tehran's state television headquarters; Iranian missiles have struck Tel Aviv.

Americans strongly support preventing Iran from acquiring nuclear weapons according to Reagan Institute poll, as Trump reiterates stance amid Israel-Iran conflict

Nine countries currently either say they have nuclear weapons or are believed to possess them. The first to have nuclear arms were the five original nuclear weapons states — the United States, Russia, China, France and the United Kingdom.