The public will have to decide on what to do with Prime Minister Najib Abdul Razak, should Pakatan Harapan take over Putrajaya, said former premier Dr Mahathir Mohamad today. 

Asked on what he plans to do with his current nemesis, Mahathir said: "It's up to the people. They would want to have some action taken against him.

"Even if I try to have a deal with him, it's not going to work because people are very angry with Najib."

Mahathir was speaking at a Facebook live session with Thailand's Nation Multimedia Group chairperson Suthichai Yoon this morning.

Meanwhile, asked whether he was ready to become prime minister again if Harapan wins, Mahathir answered with a quick “no”.

“I don't want to become prime minister again.

“But I do want to have some influence and ability to advise the future prime minister on how to tackle the problems created by Najib,” he said.

The former premier, who has never minced his words when it comes to Najib, was also asked whether he was afraid of getting hauled to court over his remarks on Najib.

"So far he has not sued me. I've called him a thief, robber, pirate, he has not sued me," he noted.

Mahathir, however, said that Najib, instead, was trying to dig up records on the money lost by Bank Negara during his tenure as prime minister.

"He is trying to imply that it was me who directed Bank (Negara) to do all kinds of things.

"He has set up a royal commission of inquiry (RCI) to look into what happened 30 years ago which was cleared by Parliament."

It is through this move, Mahathir believes, that he could be arrested for.

"(But) one has to take risks," he said, when asked whether he was afraid if this were to happen.

On another matter, asked on who was more popular between Najib and him, Mahathir cheekily said that based on the many polls conducted, Najib has always been "at the bottom".

The RCI was set up to determine the veracity of the allegation surrounding the forex losses incurred by Bank Negara and its implications on the national economy.

The forex scandal occurred during the 1980s when Mahathir was prime minister, prompting certain quarters to accuse Najib of attempting to exact political revenge against his nemesis.