Wan Rosdy, who is also Pahang menteri besar, said the AG’s admission “further affirms the affidavit I submitted to the court – that my knowledge of this decree is genuine and not based on hearsay”.

Last year, a High Court judge had described as “purely hearsay” the affidavits filed by Najib, Umno president Ahmad Zahid Hamidi and Wan Rosdy on the existence of a royal order by the former Yang di-Pertuan Agong allowing Najib to serve the rest of his jail sentence under house arrest.

Justice Amarjeet Singh had dismissed Najib’s application to commence judicial review proceedings against the government to compel the production of the royal decree. The judge said there was no arguable case to warrant a full hearing and that the affidavits were purely hearsay.

Wan Rosdy had stated in his affidavit that Tengku Zafrul Aziz had told him the document was issued by Al-Sultan Abdullah Sultan Ahmad Shah, who was then the Yang di-Pertuan Agong.

The Federal Court was told on July 9 that AG Dusuki Mokhtar, had on July 2 acknowledged the existence of the addendum but was disputing whether it was genuine or valid.

Najib wants the government to implement the order, dated Jan 29 last year, allowing him to serve the remainder of his jail sentence in the SRC International case under house arrest.

The former prime minister got wind of the addendum order soon after the Federal Territories Pardons Board announced in early February last year that his 12-year jail term was halved and the RM210 million fine reduced to RM50 million.