bloomberg:

Cutting a nuclear deal with Iranian President Hassan Rouhani and Ayatollah Ali Khamenei would be the easy part for President Obama, who must then persuade both houses of Congress to sign off on the pact. Republicans and many Democrats abhor the idea of lifting sanctions and readmitting oil-rich Iran to the global economy until it disavows all nuclear research and stops meddling through proxies in Iraq, Lebanon, Syria, and Yemen.

Advocating for an Iran truce is a loose coalition of peace groups, think tanks

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