DOVER, N.H./WASHINGTON - Democratic presidential candidate Hillary Clinton offered her most pessimistic assessment yet of the Iran nuclear deal on Thursday, telling supporters the United States should not trust Tehran to carry out the agreement."Do I trust the Iranians?" Clinton said. "Absolutely not." Clinton has largely been supportive of the agreement struck between the United States, five other world powers and Iran to limit its nuclear program in exchange for relief from economic sanctions.But in New Hampshire, she asserted for the first time that critics of the deal had "a respectable argument." The former secretary of state reiterated her belief that the deal was the best the United States could reach at present, but added later in an exchange with reporters: "No one should be deluded about the continuing threat that Iran poses to the region." Clinton said that as president, her posture toward Iran would be "Don't trust, and verify," saying the United States would employ intrusive inspections and extensive monitoring to ensure Tehran complies with the accord.