A son of the late Saudi king was the person who donated RM2.6 billion to Prime Minister Najib Abdul Razak, revealed attorney-general Mohamad Apandi Ali.
However, he refused to provide the identity of the donor.
"We know his (the donor) name. He is not the late Saudi King but the son of the king. He is still alive," the top prosecutor was quoted by Sin Chew Daily in an exclusive interview.
Apandi said that Malaysia Anti-Corruption Commission (MACC) officers have obtained a statement from the donor as detailed in the anti-graft body's report.
Apandi also insisted that the motive behind the donation is not important, and such a donation is not illegal under Malaysian law.
"Why are people asking for the reason of the donation? You have to ask the donor. He has billions in his coffers. (If) he wanted to give the money, what's the problem?
"This is his money and his personal matter. We don't have a law to state receiving political donation is illegal," added Apandi.
Apandi last month said Najib had returned RM2.03 billion of the RM2.6 billion to its original donor, who he said was a member of the Saudi royal family.
The top prosecutor cleared Najib of criminal wrongdoings in the RM2.6 billion donation affair as well as the RM42 million SRC International case. Both cases were probed by MACC.
Cases can be reopened with new evidence
However, Apandi stressed the AG's Chambers will reopen the cases should MACC find new evidence.
"When we said close the cases, we didn't bury them underground and won't reopen them. No such thing," he said, adding that the two cases are similar to the one investigated by Bank Negara.
He said should MACC not obtain new evidence, his answer will be same as the one he gave to Bank Negara.
"Bank Negara had written to me to reopen their case. I asked Bank Negara where is the new evidence? They said none.
"Then the answer (to MACC) is the same," related the AG.
Last October, the AG has cleared 1MDB officials of wrongdoings with regard to the investigation carried out by Bank Negara.
This is despite a Bank Negara request for the AG to review his decision.
Bank Negara had proposed to initiate criminal prosecution against 1MDB for breaching the Exchange Control Act 1953 and for knowingly or recklessly making a false statement about the company's finances.