Jim Webb became the first 2016 Democratic presidential candidate to criticize the Obama administration's nuclear deal with Iran, saying "at this point I would be very skeptical if I were still in the Senate."

"I am concerned principally that this might actually increase the imbalance in the balance of power in the region," Webb said during an NPR interview on Wednesday.

Webb is the only combat veteran running for president in 2016. He is also the most conservative Democrat running, having previously served as a secretary of the navy in the Ronald Reagan administration. He served a single term in the Senate representing Virginia.

Just hours after the deal was released on Tuesday. Webb provided a statement lauding the agreement as "an important moment in terms of the future of American policy," but saying that he needed to read the full text closely to reach his final conclusion.

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