Donald Trump has suggested to defense officials it would make sense for the US to launch strikes against Iran only if the so-called “bunker buster” bomb was guaranteed to destroy the critical uranium enrichment facility at Fordow, according to people familiar with the deliberations.

Trump was told that dropping the GBU-57s, a 13.6-tonne (30,000lb) bomb would effectively eliminate Fordow but he does not appear to be fully convinced, the people said, and has held off authorizing strikes as he also awaits the possibility that the threat of US involvement would lead Iran to talks.

The effectiveness of GBU-57s has been a topic of deep contention at the Pentagon since the start of Trump’s term, according to two defense officials who were briefed that perhaps only a tactical nuclear weapon could be capable of destroying Fordow because of how deeply it is buried.

Trump is not considering using a tactical nuclear weapon on Fordow and the possibility was not briefed by defense secretary Pete Hegseth and the chairman of the joint chiefs of staff Gen Dan Caine in meetings in the White House situation room, two people familiar with the matter said.

But the defense officials who received the briefing were told that using conventional bombs, even as part of a wider strike package of several GBU-57s, would not penetrate deep enough underground and that it would only do enough damage to collapse tunnels and bury it under rubble.

(http://www.autoadmit.com/thread.php?thread_id=5740396&forum_id=2,#49031662)

(http://www.autoadmit.com/thread.php?thread_id=5740396&forum_id=2,#49031669)

nuclear option:

https://www.afnwc.af.mil/About-Us/Fact-Sheets/Article/2074643/b-2-spirit/

(http://www.autoadmit.com/thread.php?thread_id=5740396&forum_id=2,#49031719)