This week, the most senior U.S. official working with the United Nations in Afghanistan went on "leave" out of frustration over the lack of response to fraud in the country's presidential election. The head of the European Union's election-monitoring commission said that as many as one-third of the votes President Hamid Karzai received were "suspect" and should be investigated. And Afghans themselves continue to criticize not just the controversial election, but also the government's response to it. If this continues, it will fatally undermine the next Afghan government and the efforts of its international supporters. Steps should be taken immediately to avert a potentially violent legitimacy crisis.