Former Pentagon official, Michael Rubin, believes U.S.’s strike was necessary to halt Iran’s nuclear advances. ➡️ There is ‘no deterring’ what the Islamic Revolutionary Guard Corps might do if they had custody of a nuclear weapon, Rubin told CNBC’s Dan Murphy. ➡️ Rubin also believes that Iran will ‘retaliate asymmetrically’ but they're not going to hit people where they most expect it. CNBC’s @Dan Murphy reports.