(CNN) – Sen. Marco Rubio showcased his foreign policy experience at an event on Thursday at the Council on Foreign Relations in New York, as another Republican presumed to be on Mitt Romney's vice presidential shortlist visited Israel.
Rubio said he is "convinced without a shadow of a doubt that Iran is pursuing a nuclear weapons program," and reluctantly expects that negotiations with and sanctions upon the Mideast nation will fail. In that case, "a military option may be necessary."
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"Everything else should fail if we get to that stage.," Rubio said, adding that he does not want to "come across as some sort of saber rattling person."
While Rubio spoke, his Senate colleague, Rob Portman of Ohio, was in Israel, where he met with Israeli Prime Minister Benjamin Netanyahu.
Rubio said Syria is seen as a "test case" by other nations as to U.S. resolve, and said that there are times for unilateral action.
He also fielded questions on Egypt and domestic politics, saying that the GOP's message of "economic mobility and economic empowerment" should resonate with Latino voters, if the party "invests the time" communicating with Hispanic voters.
Asked his thoughts about sharing the presidential ticket with Romney, Rubio shook his head.
Declining to go deeper into the question, he replied, "I appreciate you trying to work that in."
- CNN's Gregory Wallace contributed to this report