Najib's political secretary Datuk Muhammad Khairun Aseh who told Sinar Harian this said the report was criminal defamation.
He told the daily the report was done with bad intention, unsubstantiated and based on dubious sources.
"We will take legal action," he told the daily yesterday.
On Friday, WSJ and Sarawak Report had published reports of the 1MDB money transferred to Najib's personal Ambank account.
Sarawak Report meanwhile in its report claimed that RM42 million had been transferred into Najib’s accounts from SRC International Sdn Bhd, a company owned by the Finance Ministry.
1MDB said Friday said it had never provided any funds to Najib.
The Prime Minister’s Office in a statement issued on their Facebook account said the latest claim was part of a continuous political sabotage aimed at misleading the media and the public by using amended documents.
Meanwhile, Najib is urged to come forward and address the allegations levelled at him through a live speech addressed to all Malaysians.
Perak Malaysian Youth Parliament (PBM)
"Other than waiting for investigation