Later yesterday, Najib - who has been under growing pressure from inside his Barisan Nasional (BN) coalition since the landslide loss - announced he was quitting as head of BN as well as its main party. He said former deputy prime minister Ahmad Zahid Hamidi will take over as BN chairman and Umno president, while former defence minister Hishammuddin Hussein will take on the duties of deputy Umno president and deputy BN chairman.
The announcement followed strong calls from the party for the 64-year-old to step down.
The National Front, which has ruled Malaysia since independence from Britain, won only 79 of the 222 parliamentary seats, losing power to Mahathir's four-party alliance amid public anger over the 1MDB scandal and a rising cost of living.
Mr Najib responded swiftly by saying he respected the department's ruling and would stay with his family in the country.
Najib has said the deposit was a donation by an unnamed member of the Saudi royal family which had been largely returned.
Police said they were acting after a complaint that a government vehicle had delivered dozens of boxes made to carry designer handbags and other items to the apartment for Najib's wife, Datin Seri Rosmah Mansor.
TRT World spoke to Jakarta-based journalist Zan Azlee for more details.
"I pray that after this divisive period, the country will unite", he wrote as part of his posts on Twitter and Facebook.
"President Donald J Trump congratulates Tun Dr Mahathir Mohamad on his having been sworn in today as the new Prime Minister of Malaysia".
David Moyes will reportedly hold talks with West Ham board next week
Paul Pogba and Mark Noble were both booked for their part in a feisty exchange, with the Hammers skipper lucky not to see red. With Manchester City confirmed as champions on April 15, United required a point to seal a second-place finish.
Newly elected Malaysian Prime Minister Mahathir Mohamad on Saturday named three ministers in his "small cabinet" and announced the establishment of a "council of elders" to advise the government, taking the first step in governing the country.
Mahathir also said that the government would set up a "council of elders".
He apologised for his mistakes and shortcomings and said he intends to continue serving the people.
Then the Wall Street Journal (WSJ) reported it had seen a paper trail that allegedly traced close to $700m from the fund to Mr Najib's personal bank accounts.
Najib's premiership was battered by allegations he oversaw the plundering of billions of dollars from sovereign wealth fund 1MDB. There was no sign that Najib or Rosmah had come to the airport.
The general elections took the top spot trending in Malaysia with political topics such #MalaysiaMemilih and #PakatanHarapan, occupying 7 of the top 10 trends in the country.
At 92, Mahathir is the world's oldest state leader.