sentences:  Emilio Portes Gil was interim president of Mexico from December 1928 until February 1929, while a political rather than military solution was sought for presidential succession.The intent to found the party was to institutionalize the power of particular victors of Mexican Revolution.Calles was ineligible to run for president, since he had just completed a four-year term, because of the prohibition in the 1917 Constitution of re-election directly after serving a term as president.