Romney later attempted to clarify his position.
"I respect the right of Israel to defend itself, and we stand with Israel in peace," Romney said in an interview with CBS' "Face the Nation."
Romney is on a seven-day overseas trip in which he hopes to burnish his foreign policy credentials. The trip started Friday in England, will continue this weekend in Israel and conclude in Poland.
Israeli Prime Minister Benjamin Netanyahu on Sunday welcomed Romney as "a representative of the United States" and said he agrees with his approach to the threat of a nuclear Iran.
Netanyahu said he listened to a recent Romney speech in which he said that Iran possessing nuclear capability is the greatest danger facing the world.