Then prime minister Najib Abdul Razak was given the code name ‘Optimus Prime’ by fugitive businessperson Low Taek Jho (Jho Low), the Kuala Lumpur High Court heard.

The former finance minister’s former relationship manager Joanna Yu testified today that this was what the acronym “OP” stood for in a transcript of an alleged conversation between her and Low.

During this morning’s RM2.28 billion 1MDB corruption trial against Najib...