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Hate him or love him, Dr Mahathir Mohamad is a towering figure, having been prime minister for 22 years and overseeing rapid development of the country.

But Mahathir was also severely criticised for his authoritarian ways and his ruthlessness in crushing the reformasi movement, something that he has remained unapologetic to this day.

This was evident at his press conference on Tuesday when Mahathir was pressed on whether he stood by his statement in 1998 that PKR de facto leader Anwar Ibrahim was "morally unfit" to be prime minister in wake of his sodomy charges.

Mahathir refused to give a serious answer.

"I stand by my statement at that time. It depended on the circumstances prevailing at the time. I might change my mind again next year," he had said.

The response was typical of Mahathir's art of self-mockery which he has so successfully used to charm even his critics on the Pakatan Harapan ceramah circuit.

One can either laugh off the statement or take it seriously - the latter of which would raise serious concerns about Mahathir's commitment to institutional reforms.

Mahathir has no doubt made a lot of concessions in trying to mend old wounds but his vision beyond ousting Prime Minister Najib Abdul Razak has been vague.

Instead of giving his firm commitment to reforms like his Harapan partners, Mahathir had often responded by stressing the need to win first, then "maybe" there can be reforms.

Despite doubts against Mahathir, the 92-year-old Parti Pribumi Bersatu Malaysia (Bersatu) has helped pull the opposition together, minus PAS.

Some in the opposition see Mahathir as the best option in a difficult environment. But given Mahathir’s mercurial track record, there is no guarantee that he would not bring Bersatu back to Umno after having successfully dislodged Najib.

When the issue of Mahathir's trustworthiness is raised with PKR, DAP or Parti Amanah Negara leaders, many have stressed the need to put aside past grievances but refused to give a direct "yes" or 'no" answer.

So do you trust Mahathir? Malaysiakini puts these four questions to our readers.