The first round of a new presidential election must be organized no sooner than twenty days and no later than thirty-five days following the vacancy of the presidency. Fifteen days can separate the first and second rounds of a presidential election; this means that the president of the Senate can only act as President of the Republic for a maximum period of fifty days. During this interim period, acting presidents are not allowed to dismiss the national assembly, nor are they allowed to call for a referendum or initiate any constitutional changes.