The chairman of the Joint Chiefs of Staff announced Sunday the U.S. has a plan in place to attack Iran if needed.

U.S. Admiral Mike Mullen said the situation with Iran is so unstable that a military strike could have serious consequences, but warned the risk of the Islamic republic developing a nuclear weapon is unacceptable.

"I think that the military options have been on the table and remain on the table, and certainly in that regard its one of the options that the president has," Mullen said. "And I hope we don't get to that...but it's an important option and it's well understood."

Tehran has already threatened a strong military response of their own should the U.S. or Israel decides to take military action against the Islamic republic.

Iranian military officials said that all it will take to provoke such a move is the "slightest aggression against Iranian soil."

"The Persian Gulf is a strategic region. If the security of this region is endangered, they will suffer losses too and our response will be firm," Revolutionary Guard deputy chief Yadollah Javani said.

Iranian officials have continually threatened to target Tel Aviv, the second-largest city in Israel.