The Pentagon's top leaders have doubled down on how destructive the U.S. attacks on Iran's nuclear facilities have been. Secretary of Defence Pete Hegseth has held a news conference responding to a leaked intelligence report that suggests the American strike put the country back by only a few months. Hegseth made the comments alongside the Chairman of the Joint Chiefs of Staff, General Dan Caine. Together they showed off the weapons they say completely destroyed Iran's underground nuclear facilities. Caine said it had taken 15 years of research to create a bomb that could penetrate the Fordow nuclear facility being built deep underground by Iran. Al Jazeera's Patty Culhane reports from the Pentagon in Arlington Virginia while, Heidi Zhou-Castro joins live from Capitol Hill. Subscribe to our channel: http://bit.ly/AJSubscribe Follow us on Twitter: https://twitter.com/AJEnglish Find us on Facebook: https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/ Check out our Instagram page: https://www.instagram.com/aljazeeraenglish/ Download AJE Mobile App: https://aje.io/AJEMobile #aljazeeraenglish #israel #iran #TelAviv #idf #israelnews #irannews #Trump #Tehran #Netanyahu #iranisraelwar #Irandrones