BBC melaporkan sumber kerajaan Arab Saudi mengesahkan dana politik Najib Razak sebanyak RM 2.6 Bilion (USD $681m (£479m) didepositkan sebagai langkah membantu beliau menang pilihan raya 2013.
Sumber Saudi memberitahu BBC News derma diberikan kerana kebimbangan Riyadh terhadap ancaman Muslim Brotherhood.
Menurut sumber Saudi lagi, derma tersebut diluluskan oleh allahyarham Raja Abdullah.
The purpose of the donation was simple, said the Saudi source – it was to help Mr Najib and his coalition win the election, employing a strategic communications team with international experience, focusing on the province of Sarawak, and funding social programmes through party campaigning.
But why should the Saudis care about an election in a non-Arab country more than 6,000 km (3,700 miles) away? The answer, the source said, lay in their concerns over the rising power of the Muslim Brotherhood, which they consider a terrorist organisation.
The Saudis were already upset at events in Egypt, where President Mohammed Morsi was busy consolidating the Brotherhood’s hold on the country.
Supporters of ousted Egyptian President Mohammed Morsi in Cairo in June 2012Image copyrightGetty Images
Saudi Arabia was concerned by the rise of Mohammed Morsi’s Muslim Brotherhood in Egypt
It would be another three months before Mr Morsi was to be deposed by the army, and the Saudis were convinced that the opposition was being supported by the Brotherhood and Qatar, which backed the Brotherhood and other Islamist groups in the Middle East.
So how unusual is it for the Saudi royal family to hand over this amount of cash in a personal donation? Not at all, said the Saudi insider, adding that Jordan, Morocco, Egypt and Sudan have all been beneficiaries of multi-$100m donations from the Saudi royal purse.
“There is nothing unusual about this donation to Malaysia,” he said. “It is very similar to how the Saudis operate in a number of countries.”