The decision to launch a full-on attack on Iran would be in the gray area between the president’s powers as commander in chief and the Constitution’s mandate that only Congress can declare war.

The U.S. is shifting military aircraft and warships into and around the Middle East to protect Israel from Iranian attacks as President Donald Trump warns Tehran to step back from the conflict.

Iran's Fordo nuclear site is one of the most heavily fortified. There's only one conventional weapon that could destroy it - and only the US is known to have it.

Only the U.S. military has the 30,000-pound bomb capable of reaching the facility and the bomber that can carry it.

The US may consider supplying Israel with bunker-buster bombs to target Iran's Fordo nuclear facility. These bombs, capable of penetrating deep into mountains, could significantly damage the site. However,

Israel's ability to neutralize Iran's fortified Fordo nuclear facility is constrained by its lack of bunker-busting capabilities. The US-controlled GBU-57 A/B Massive Ordnance Penetrator is the only weapon capable of breaching Fordo's defenses.