The former prime minister of Thailand, Thaksin Shinawatra, received a fraudulent passport from the Ugandan government, a Uganda's parliamentary watchdog claimed last week.
Nandala Mafabi, the chairman of the public accounts committee, told the Daily Monitor that an unnamed whistleblower had told the committee: "The government issued a diplomatic passport to Mr Shinawatra as a way of enticing him to invest here."
Thaksin, who was deposed in a military coup in 2006, has a number of business investments in Uganda including lottery licenses and several goldmines.
The Parliament of Uganda has continued to question the circumstances under which diplomatic passports are issued in the country.
This follows reports that Thaksin and former rebel leader in the Democratic Republic of Congo, Wamba Dia Wamba holds Uganda's diplomatic passports.
The Parliamentary Public Accounts Committee is also questioning how Uganda's business tycoons, Michael Ezra, Moses Kalungi Hassan Basajjabalaba and Kananathan Veluppillai acquired the country's diplomatic passports.
Hassan Basajjabalaba, Kananathan and Michael Ezera are widely known to be supporters of the ruling National Resistance Movement.
The MPs on the committee say some office cleaners from the region where most leaders of the country come from also hold diplomatic passports.
The MPs seating on the committee are so concerned that the criteria followed in issuing diplomatic passports has been abused by some officials and supporters of the ruling government.
The legislators say due to abuse of office in the Ministry of Internal Affairs many wrong doers pretending to be supporters of the ruling government have acquired the Ugandan diplomatic passport and ended up committing crimes on the international scene.
The MPs want police to investigate the circumstances surrounding the issuance of diplomatic passports in the country.