"Assuming, that is, that Iran is a threat."

Hillary Clinton calls Iran a threat to U.S., Israel

House Speaker Nancy Pelosi: "House Speaker Nancy Pelosi: "Iran is not just an Israeli problem, it's not just a problem for the region, Iran is a problem for the world."

Sen. Sen. Barack Obama said Friday the use of military force should not be taken off the table when dealing with Iran, which he called "a threat to all of us."