The US military did not use bunker-buster bombs on one of Iran’s largest nuclear sites last weekend because the site is so deep that the bombs likely would not have been effective, the US’ top general told senators during a briefing on Thursday.

The deep penetrating bombs that the U.S. dropped into two Iranian nuclear facilities were designed specifically for those sites and were the result of more than 15 years of intelligence and weapons design work.

President Donald Trump said on Friday he would like inspectors from the International Atomic Energy Agency or another respected source to be able to inspect Iran's nuclear sites after they were bombed last weekend.