About 70 people, including pan-democratic lawmakers, have marched to the Department of Justice on Lower Albert Road in Central. They want the Justice Secretary Teresa Cheng to provide more detail about its decision not to prosecute former Hong Kong Chief Executive CY Leung, over a HK$50 million dollar payment he received from Australian engineering firm UGL, after he took up the post in 2012.
The protesters say they are not convinced by the government's argument that there is insufficient evidence to pursue any charges.
Democratic Party lawmaker Lam Cheuk-ting, who joined the protest, said he was unhappy that no independent legal advice had been sought before the case was dropped.
"If you compare the Mr Donald Tsang case, the Rafael Hui case, and so many former top government official cases, they all seek external legal advice," he said.
Lam said external legal advice was necessary to prevent the public getting the impression that the Department of Justice was biased.
Former Chief Executive Donald Tsang was imprisoned in 2017 for misconduct in office and the former Chief Secretary Rafael Hui was jailed in 2014 for bribery and misconduct.