WASHINGTON (AP) — Lawmakers are raising questions about the secret U.S. diplomacy with Iran that led to last month’s nuclear breakthrough, demanding greater transparency and expressing disappointment at being left in the dark.

The Associated Press has reported that much of the Nov. 24 deal among world powers and Iran resulted from a series of secret meetings between U.S. and Iranian officials. The talks took place in the Middle East sultanate of Oman and elsewhere over eight months.

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