Attorney-general Mohamed Apandi has denied Prime Minister Dr Mahathir Mohamad's accusation that he concealed evidence with regard to the 1MDB scandal.

“I deny such allegations. I will be transparent and willing to disclose all. There is nothing to hide and I did not act with any ulterior motive or agenda.

“All decisions are based on available facts and on the law, both procedural and substantive laws,” he told Malaysiakini.

Apandi also said that his conscience was clear and stressed the importance of the rule of law.

"My conscience is clear. Anyway, I will cross the bridge when I come to it.

"What is of utmost importance is that the rule of law shall prevail and whatever action to be taken or done by anyone must be in accordance to the law, in particular, the supreme law, i.e. the Federal Constitution," he said when asked to comment on Mahathir's claim.

In 2016, Apandi had cleared former premier Najib Abdul Razak of any wrongdoing.

This was over the RM2.6 billion in Najib's personal accounts which international investigations claim originated from 1MDB.

Najib, who denied abusing public funds for personal gain, claimed that the sum was a donation from a Saudi royalty with no strings attached.

The former premier had also accused Mahathir of attempting to topple him from power using false allegations.

At a press conference in Kuala Lumpur earlier, the prime minister said he was looking into the attorney-general.

"We have to look into who is the attorney-general. At the moment, the attorney-general has undermined his own credibility.

"He has, in fact, hidden evidence of wrongdoing and that is wrong in law," he said.