People close to the matter, speaking on condition of anonymity, said that Tim Leissner, who quit the powerful US investment bank last month, was called to testify relating to the payments scandal that surrounds Malaysian Prime Minister Najib Razak.
Based in Singapore as Goldman's Southeast Asia chairman, Leissner advised the state investment fund 1Malaysia Development Berhad, or 1MDB, which is at the center of allegations of secret transfers of hundreds of millions of dollars to Najib's private accounts.
According to one AFP source, Leissner, a German national, was suspended by Goldman in January for violating company policies on a matter separate from the 1MDB case. Leissner then left Goldman in February.
Late last year the US Federal Bureau of Investigation began investigating the accusations of corruption and money laundering.
Authorities in several other countries are also investigating the money flows.
Swiss authorities have said they believe $4 billion may have been stolen from Malaysian state firms and have frozen millions of dollars in accounts linked to 1MDB.
"Singapore is also cooperating closely with relevant authorities, including those in Malaysia, Switzerland and the United States," said a joint statement from the Monetary Authority of Singapore and the police Commercial Affairs Department.
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