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Secretary of State Marco Rubio attends a G7 press conference in Evian, France, on June 17. Photo: Anna Moneymaker/Getty Images

The top Democrats on congressional committees overseeing foreign, defense and intelligence policy are demanding Secretary of State Marco Rubio provide a briefing on the U.S.-Iran memorandum of understanding.

Why it matters: Unlike some of Congress' hawkish Republicans, these lawmakers aren't dismissing the deal out of hand.