A bipartisan group of US senators in Congress on Thursday introduced a bill that would impose tighter sanctions against Iran over its ballistic missile tests and other non-nuclear activities. The legislation would set mandatory sanctions for anyone involved with Iran’s missile program and those who trade with them. It would also apply sanctions to the Islamic Revolution Guards Corps (IRGC). Iran, however, maintains that none of its missiles have been designed to be capable of carrying nuclear warheads, because nuclear weapons have basically no place in the Islamic Republic’s defense doctrine. Iranian officials have underlined that the country will continue with its missile activity and that Tehran needs no permission from any country for enhancing its defense capabilities.