A key provision in the bipartisan Iran sanctions bill that the Senate introduced last week is causing widespread confusion and debate about its potential impact.
Advocates of the Iran nuclear deal argue that the bill from Senate Foreign Relations Chairman Bob Corker, R-Tenn., would label the 100,000-strong Islamic Revolutionary Guard Corps (IRGC) a terrorist group and trigger a showdown between the United States and Iran. Others, however, say it wouldn't add any new sanctions on Iran.