The police are expected to interview Umno Youth vice-chief Khairul Azwan Harun over his allegation of a high-level conspiracy to topple Prime Minister Najib Abdul Razak and the government.

"I was told that he will be coming tomorrow (to give his statement)," inspector-general of police Khalid Abu Bakar told a press conference this evening in Putrajaya.

In his police report filed on Tuesday, Khairul named recently retired Bank Negara governor Zeti Akhtar Aziz, outgoing Malaysian Anti-Corruption Commission (MACC) chief Abu Kassim Mohamed and ex-attorney-general Abdul Gani Patail.

He said the three were suspected of providing confidential information to foreign agencies, including the US Federal Bureau of Investigation (FBI), without authorisation.

Khairul also alleged that some of the documents submitted were falsified and the information twisted to achieve their agenda.

The report came in the wake of the United States Department of Justice filing civil suits related to the alleged abuse of 1MDB funds, which contained a slew of damning claims.

Meanwhile, Khalid said the Rubber Industry Smallholders Development Authority (Risda) should to get the Health Ministry to amend the law to allow people to 'own' ketum.

"The law says it is legal to plant ketum. You can have your whole estate planting ketum. But, the moment you pluck and own it, it becomes an offence," he said.

This is because, he said, ketum leaves contain the alkaloid, Mitragynine, which has psychotropic effects on human beings.

“If the law requires correction, then do it.”

However he also advised that research to identify the pharmaceutical effect of ketum should be done before the interested parties approach to the ministry.

Last Tuesday, Risda chairperson Zahidi Zainul Abidin had said the agency would request the government to allow the planting of ketum to help increase the income of rubber smallholders, due to its high demand by pharmacists in the US and Europe.