Prime Minister Najib Abdul Razak has told the High Court that he had no role in police investigations against the Malaysian Anti-Corruption Commission (MACC) that were initiated last year.

In his statement of defence that was filed yesterday against a suit former premier Dr Mahathir Mohamad and two others, Najib also denied influencing attorney-general Mohamed Apandi Ali.

In January, Mohamed Apandi had concluded that the three investigations papers submitted by the MACC on their probe against Najib could not be brought to court for criminal proceedings.

On the sacking of Muhyiddin Yassin as deputy prime minister, Najib argued that the plaintiffs must prove that the removal was related to criticisms of Putrajaya's handling of 1MDB.

"The removal of Muhyiddin as DPM is an exercise of royal prerogative under Article 43(5) of the Federal Constitution acting on the advice of the PM and such act is, again not an act of the defendant (Najib) in the exercise of his duties as an alleged public officer or as an alleged fiduciary," he said