Less than two weeks after from being voted out of office after nearly three decades in power, Najib was ordered to explain a suspicious transfer of 42 million ringgit ($10.6 million, €9 million) into his bank account.
Malaysia's former Prime Minister Najib Razak of Barisan Nasional (National Front) and his wife Rosmah Mansor show their ink-stained fingers after voting in Malaysia's general election in Pekan, Pahang, Malaysia, May 9, 2018.
That shock election result upended Malaysia's political order, as it was the first defeat for a coalition that had governed the Southeast Asian nation since its independence from colonial rule in 1957.
Mahathir, who is now the world's oldest elected leader at 92, has said his government will not go on a witch-hunt over the 1MDB fiasco but that Najib will have to face the court if he's found to be responsible.
Najib's lawyer, Harpal Singh Grewal, told reporters waiting outside the house that the former prime minister and his family were "really very unhappy" that police had confiscated clothes and shoes belonging to his children.
Najib has consistently denied any wrongdoing since the 1MDB scandal erupted in 2015, but he replaced an attorney-general and several MACC officers allegedly to shut down an initial investigation.
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Najib and his wife have been barred from leaving the country after the new government reopened an investigation into the case.
While Najib was called in by the MACC for questioning on Tuesday, Shukri said he was not going to be taken into custody just yet and that the investigation was still ongoing.
Mahathir also announced a renewed effort in investigating the 1MDB scandal. At the time, a member of the Saudi royal family said the funds were a "personal donation", and Shukri said on Tuesday they approached that prince who confirmed making the donation. "Instead we were accused of bringing down the country, we were accused of being traitors", Shukri said.
SRC was created in 2011 by Najib's government to pursue overseas investments in energy resources, and was a unit of 1MDB until it was moved to the finance ministry in 2012.
The U.S. Justice Department said in a statement that it looks forward to working with Malaysian law enforcement in investigating the 1MDB case. Reports have stated that the police have still not finished counting the seized cash.
Najib started 1MDB in 2009, but the fund accumulated billions in debts and is being investigated overseas.