A US prosecutor on Monday urged jurors to convict a former senior Goldman Sachs banker for helping loot billions of dollars from Malaysia's 1MDB sovereign wealth fund, while the defence accused the government's star witness of lying.

In her closing argument in Brooklyn federal court, assistant US attorney Alixandra Smith said the defendant Roger Ng received more than US$35 million in kickbacks from the "brazen" bribery and money laundering scheme and must be held accountable.

Ng's lawyer Marc Agnifilo countered that...