Iran's President Hassan Rouhani registers to run for a second four-year term in the May election, in Tehran, Iran, April 14, 2017. Rouhani won the 2013 elections by a landslide and was credited for engineering a landmark 2015 nuclear deal between Iran and six major world powers through which the country agreed to contain its nuclear activities.
The six approved candidates, including the incumbent Hassan Rouhani, begin campaigning.