Activist Srisuwan Janya has asked the Election Commission to investigate the legality of Future Forward leader Thanathorn Juangroongruangkit's loans to his party, and whether he should be suspended from politics.
Mr Srisuwan, secretary-general of the self-styled Association for the Protection of the Thai Constitution, said at the Office of the Election Commission on Monday that his complaint targeted Mr Thanathorn's declaration to the National Anti-Corruption Commission of loans totalling 191 million baht made to the FFP.
One was for 161.2 million baht and the other 30 million baht. It was reported the loans were to fund the recently founded party's campaign for the March 24 election.
According to Mr Srisuwan, the organic law on political parties does not allow them to borrow money or use their assets to repay a loan.
That could eventually result in the FFP being declared bankrupt and being disqualified.
It also meant the FFP and Mr Thanathorn were in violation of the organic law, Mr Srisuwan said.
When he raised the issue last week, Mr Srisuwan said that if found guilty of violating the law on campaign donations, Mr Thanathorn would be liable for up to five years in prison and be stripped of his election rights for five years.