Former premier Mahathir Mohammad, who has led calls for Najib's ouster accusing him of corruption and misgovernance and remains an influential figure, made an appearance at the rally like yesterday and said: "I think he (Najib) will not step down".
"He knows when he has no power, he may be made to face the court. The court may find him guilty and he may have to go to jail."
"But please don't push too much. Yesterday I tried to walk - and I appreciate people wanting to shake my hand - but if you push, I am an old man of 90, so you must treat me gently," he said with a smile.
Thousands of protesters clad in bright yellow T-shirts slept on streets near the Merdeka square last night and continued the rally today calling for electoral reforms.
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Najib has been struggling to stay afloat for his political survival since The Wall Street Journal last month published documents showing nearly USD 700 million had been deposited in his personal bank accounts.
Demonstrators called for his resignation over the scandal even as authorities declared the rally illegal, blocked the organisers' website and banned their official bright yellow T-shirt and logo.
Deputy Prime Minister Zahid Hamidi, also the home minister in charge of domestic security, said the organisers face possible charges under assembly, sedition among others.
Najib has denied the accusations while the anti-graft body said the money was not funnelled out of the debt-ridden state fund as alleged but was given by a Middle Eastern donor whose name has not been disclosed.
The embattled premier hit back at the wide-scale protests, saying: "What is 20,000? We can gather hundreds of thousands".
"The rest of the Malaysian population is with the government," local media quoted him as saying at an event in a northern state.