The Iranian nuclear program’s heavy-water reactor at Arak. Photo: Wikimedia Commons.

Wall Street Journal – Delays and unresolved disputes in international nuclear negotiations with Iran have hardened criticism from U.S. lawmakers, pointing to a growing likelihood that the GOP-controlled Congress will try to undercut a final deal this summer.

Republicans, who initially reacted to the talks with skepticism, have expressed deepening doubts this week that Obama administration officials will be able to reach an accord with Iran that lawmakers can support.

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