(NewsNation) — It would be “entirely fair game” for Israel to target Iran’s nuclear facilities in retaliation for last weekend’s drone and rocket attacks, according to John Bolton, former U.S. ambassador to the United Nations in the George W. Bush administration.

He also said Iran should be worried about such an attack.

“The likelihood (Israel) will retaliate for Saturday night’s attack is near 100%,” he told NewsNation’s “Elizabeth Vargas Reports.”

“They (Iran) brought all this on themselves. They’re the aggressor against Israel, beginning on Oct. 7 with the Hamas attack,” he added.

Bolton doesn’t think much of the current sanctions against Iran nor of the new “targeted” sanctions announced Thursday.

“The synonym for ‘targeted sanctions’ is ‘easy-to-evade sanctions.’ Sanctions are really only effective when they’re massively applied and rigorously enforced,” he said.

The new sanctions announced by the U.S. and the U.K. target 16 people and two entities in Iran that produce engines that power the drones used in the April 13 attack on Israel. Also targeted are five firms involved in steel production and three subsidiaries of Iranian automaker Bahman Group.

The U.K. also sanctioned several Iranian military branches and individuals involved in Iran’s drone and ballistic missile industries.