Former prime minister Najib Abdul Razak testified he had full confidence in SRC International’s board to perform due diligence over billions of ringgit in investment.

He told the Kuala Lumpur High Court that he had communicated to the firm’s then-CEO Nik Faisal Ariff Kamil about “imminent investments”.

The former adviser emeritus to SRC said he relied on Nik Faisal to communicate with the board on the feasibility of seeking billions of ringgit in loans from Retirement Fund Incorporated...