International Monetary Fund says prospects 'clouded by elevated levels of uncertainty,' leading to perceived risk for potential investors

Armed Forces commander says will close vital shipping lane to all countries if its oil exports are blocked

Iran's foreign minister says leaving the pact is one of Tehran's 'many options' to retaliate against US sanctions

Chairman of the House Intelligence Committee suspects US president is still susceptible to foreign influence

In tweet, Iranian foreign minister responds to French diplomat's claim the Islamic Republic can't enrich under nuclear deal