American envoys have finalized the text of a proposal to extend an arms embargo on Iran ahead of a United Nations Security Council showdown with high stakes for the 2015 nuclear deal.

“It is a straightforward, commonsense measure requested by countries in the Middle East that have suffered the most as a result of the Iranian regime’s active support for terrorism and mayhem across the region and beyond,” said Kelly Craft, the United States ambassador to the U.N.