Dr Mahathir Mohamad has once again dared Prime Minister Najib Abdul Razak to face him in a public debate.

The former premier claimed that Najib had dodged the two previous Nothing to Hide forums out of fear despite the latter being three decades younger than him.

“Yes. I will turn 93 in July. Yes. 93 is old. Najib need not fear me. But Najib is afraid. Afraid to debate with me,” he said in a blog posting this morning.

“YAB (Najib) is still young. Why fear debating with someone in his nineties. If you have nothing to hide, say it openly and this old man would try to prove how you hid all sorts of things,” he added.

Mahathir said the people could then judge whether it is the “old or young” who is concealing facts.

“Come with your top officials and young ministers. Bring experts from foreign countries, including Cambridge Analytica to whisper answers (in your ear) when you are unable to answer,” he added.

Mahathir, who is now the chairperson of Pakatan Harapan, said Najib (photo) could also quiz him on his record of being the prime minister for 22 years.

“Ask about the loss of billions by Bank Negara (in foreign exchange), Perwaja (Steel) and others. I won't bring experts. Just myself,” he added.

Mahathir also said he realises that he would not live for too long.

“I know I would go soon. But as long as there is life in my body, I would struggle for the race, religion and this beloved nation.

“With other patriots, I would try to save this nation from a kleptocrat. To Allah, I surrender myself,” he added.

Mahathir had also claimed that the police were ordered to stop the first Nothing to Hide forum in 2015 while he blamed Najib's supporters for causing a ruckus at the second one last year.

In June 2015, the Dewan Rakyat was told that Najib wanted to attend the forum but the police did not allow him to do so due to security concerns.

As for the second forum, BN claimed that tempers flared when Mahathir was posed with a question on the Memali incident which happened during his tenure.

Last week, Najib had told Malaysians not to put the future of the nation in the hands of a 93-year-old in reference to Mahathir being named as Harapan's prime minister-designate.