 Complete the following phrase:  Some analysts have questioned either the existence, applicability andor constancy of the fatwa. According to Mehdi Khalaji, Khamenei may alter his fatwa under critical circumstances, as did his predecessor, Ayatollah Khomeini, on some civil and political issues. According to Gareth Porter writing in Foreign Policy, Irans aversion to nuclear and chemical weapons is sincere because of the historical episode during its eight-year 