Killing of Iranian nuclear scientist has region, world leaders on edge over potential retaliation from Iran

…When, how and if such a reprisal could occur has world leaders – and critical players in the region – on edge. "The calculation is that the Iranians are unlikely to respond now because they want to preserve the option for future talks due to the economic problems of the country," Jason Brodsky, the policy director for United Against a Nuclear Iran (UNAI), told Fox News. "Nevertheless, the assassination could impact the political debate in Iran in the near-term, further weakening Rouhani's already eroded domestic political standing."