Former Secretary of State Hillary Clinton will be partly responsible for whatever agreement comes from the nuclear negotiations between six world powers and Tehran, NBC News' Andrea Mitchell said Thursday.

"[Clinton's] going to have to own this politically — the pros and cons of this deal — if it comes together," she said.

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Secretary of State John Kerry is in Vienna negotiating a possible deal with Iran over its nuclear ambitions. His involvement in the process comes only after Clinton started the ball rolling when she was head of the State Department.