Mexico City - There is sufficient evidence to uphold charges that the brother of former President Carlos Salinas plotted the murder of a top official of Mexico's ruling party, a senior official told the daily La Reforma yesterday. Assistant attorney general Jose Luis Ramos said there were "sufficient elements to uphold" charges that Raul Salinas plotted the 1994 killing of former head of the Institutional Revolutionary Party (PRI), Jose Francisco Ruiz Massieu. He also said Massieu's brother, Mario, tried to "cover for the former president's brother" when, as an assistant attorney general, he was in charge of the investigation.