The prominent whistleblower is being investigated for criminal defamation over claims by a woman named as a star prosecution witness in a corruption case involving the prime minister's former aide.

Albert Tei also appeals to the ruler over the appointment of two graft-tainted politicians to Sabah state companies.

Remarks by Anthony Loke in a recent Chinese-language podcast make the rounds as Umno delegates debate the party's future cooperation with DAP.

The businessman behind the corruption scandal involving the PMO also files a suit against MACC for parading him in the orange lock-up shirt before being found guilty.

The man behind shocking allegations of corruption involving the country's highest office says he will not remain silent despite attempts to intimidate him.

Sofia Rini Buyong also appears to defend Shamsul Iskandar Mohd Akin, saying he gained nothing from issuing such letters as he was simply following an order from his boss.

Mahajoth Singh was told to appear before MACC on Sunday morning, a move condemned by lawyers as unlawful and a breach of client confidentiality.

The wife of businessman Albert Tei says her recording of the conduct of armed and masked officers inside their house was also deleted.

The businessman at the centre of an explosive scandal involving the nation's top office was interrogated by MACC officers at his home.

Drama unfolds as the Prime Minister's Office gets entangled in one of the most serious graft scandals in recent years.

This comes despite the agency saying the businessman would only be questioned next week.

This follows the emergence of a second video showing a woman stating that the MACC chief had always known about a plot said to be orchestrated by the prime minister and his aide to record incriminating videos of Sabah politicians.