How will Iran's presidential election impact the US?

Iranians are heading to the polls on Friday to cast their vote in the presidential election. The country's president Hassan Rouhani, a moderate Rouhani helped broker the 2015 deal with the U.S. and the West to halt Iran's nuclear program in exchange for sanctions relief. A Rouhani win could signal that Iran would stick with its end of the nuclear deal, while a conservative candidate could disrupt the agreement.