WASHINGTON, DC - SEPTEMBER 09:  Republican presidential candidate Donald Trump addresses a rally against the Iran nuclear deal on the West Lawn of the U.S. Capitol September 9, 2015 in Washington, DC. Thousands of people gathered for the rally, organized by the Tea Party Patriots, which featured conservative pundits and politicians.  (Photo by Chip Somodevilla/Getty Images)
Donald Trump and Iran: the one thing to know
Donald Trump has been a frequent critic of the nuclear deal with Iran. Here is the one thing you need to know about the complex relationship.
01:36 - Source: CNN
Iran - U.S. relations 15 videos
WASHINGTON, DC - SEPTEMBER 09:  Republican presidential candidate Donald Trump addresses a rally against the Iran nuclear deal on the West Lawn of the U.S. Capitol September 9, 2015 in Washington, DC. Thousands of people gathered for the rally, organized by the Tea Party Patriots, which featured conservative pundits and politicians.  (Photo by Chip Somodevilla/Getty Images)
Donald Trump and Iran: the one thing to know
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