Amadou retained his post as President of MNSD-Nassara, but in 2008 faced another challenge. The Gendarmerie Nationale of Niger opened another investigation into the former prime minister, this time on charges he had embezzled 100 million CFA (Euros152,500) of foreign aid for independent press and communications development during the 2000 to 2006 period. Subsequent High Court investigations reduced the alleged amount by two-thirds. Mamadou Tandja called a special session of the National Assembly on 14 June 2008 to examine the case, as all sitting members of parliament hold immunity from prosecution. While the men had previously been close political allies, with Amadou seen as Tandja's chosen successor, their relationship had deteriorated during Amadou's years in office, and it was rumoured that the two had become rivals. Amadou publicly claimed that the charges were a "political plot" by portions of his own party. Amadou faced both a jail term and the loss of his right to hold political office in Niger if convicted.