The Wall Street Journal | Sune Engel Rasmussen and Farnaz Fassihi: Iranian President Hassan Rouhani scrambled Tuesday to avert a political crisis from the resignation of the country�s top diplomat, praising his fellow moderate foreign minister on live television and dispatching senior officials to urge him not to quit.

Foreign Minister Javad Zarif, an architect of the 2015 Iran nuclear deal, resigned unexpectedly Monday on Instagram. His exit was prompted by his exclusion from an unannounced visit by Syrian President Bashar al-Assad.

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