Closing arguments are set to begin in the US trial of a former Goldman Sachs banker accused of helping loot hundreds of millions of dollars from Malaysia's 1MDB development fund.

Prosecutors said Roger Ng, Goldman's former top investment banker for Malaysia, helped his then-boss Tim Leissner embezzle money from the fund, launder the proceeds and bribe officials to win business for Goldman.

Ng, 49, has pleaded...