"I really hope it's a serious offer," the minister says of the presumed Iranian response.
Rubio, who is meeting the press during his ongoing visit to Rome, also claims that Iran's claim to control the Strait of Hormuz is "unacceptable."
"Iran is now claiming that they own - that they have the right to control - an international waterway. It's an unacceptable thing that they are trying to normalize," he told reporters.
