Israeli leaders say strikes on Tehran were necessary to head off an imminent threat that Iran would build nuclear bombs. Former Secretary of Defense Leon Panetta joins Ali Vitali to share why targeting Iran's nuclear sites is really difficult. For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/ » Subscribe to MSNBC: https://www.youtube.com/msnbc » Subscribe to MSNBC on TikTok https://www.tiktok.com/@msnbc » Subscribe to MSNBC on