Congress must pass a bill to revoke the US sanctions, which is a separate act of legislation from assenting to this deal. There are several Executive Orders wh

Congress must pass a bill to revoke the US sanctions, which is a separate act of legislation from assenting to this deal. There are several Executive Orders which Obama can revoke but the embargo proper is embedded in US legislation. https://en.wikipedia.org/wiki/U.S._sanctions_against_Iran https://en.wikipedia.org/wiki/U.S._sanctions_against_Iran