Chen Shui-bian, former President of the Republic of China, stepped down on May 20, 2008, the same day that Ma Ying-jeou took office as the new President of the Republic of China. Just one hour after he left the Presidential Office Building, now as a former President of the Republic of China and lost his presidential immunity, he was controlled and limited from leaving the nation by Taiwanese prosecutors due to allegations of corruption and abuse of authority. Chen has been named as a suspect in a fraud case involving the handling of a special presidential fund used to pursue Taiwan's foreign diplomacy. The Supreme Prosecutor's Office stated that: "We have formally started the investigation of the special expenses case concerning former president Chen. The office has assigned ... a seven-member investigative unit to take charge of the case." President Ma Ying-jeou moved to declassify documents that will aid in the investigation of the former president's use of special expenses. President Ma was then swiftly sued by Chen's lawyers on August 6, 2008, calling Ma's declassification of case-aiding documents, "politically motivated."