The former Prime Minister's Barisan Nasional coalition suffered a shock defeat in national elections earlier this week, paving the way for a return to power of Mahathir Mohamad.
"I've been informed that the immigration department is barring me and my family from leaving the country", Najib said in a tweet Saturday.
As an image of the leaked manifest for a flight to Jakarta spread like wildfire online, Najib insisted in social media posts he was planning only a "short break" overseas to rest after the election and would be back next week. The second source, a lawmaker, said the announcement could come as soon as Saturday when Mahathir is expected to name members of his new cabinet. "I respect the decision and I will remain in the country with my family", he said.
He denied any wrongdoing and was cleared by Malaysia's attorney-general, even as United States authorities alleged that over $4.5 billion was stolen from the fund in a fraud orchestrated by a financier known to be close to Najib and his family.
The fund was started by Najib when he took power in 2009, but it accumulated billions in debts and is being investigated in the U.S. and several other countries. Mahathir has said that if Najib were found to do something wrong, "he will have to face the consequences".
Malaysian ex-leader Mahathir Mohamad, 92, met with the king Thursday as he sought permission to swiftly form a government and quell concerns around the succession after a stunning win over the coalition that has ruled for six decades.
Lim told reporters after his appointment that the government's plan was to review all contracts to ensure that jobs and business opportunities for Malaysians were made secure, as well as to reduce the financial burden on low-income groups.
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As a white van with heavily tinted windows attempted to pass, the crowd surrounded the vehicle and demanded to know who was inside.
Speaking at a news conference, Mahathir also said he would announce a 10-member cabinet on Saturday, including ministers for finance, defense and home affairs.
The attorney general, Apandi Ali, declined to comment.
He said restrictions had been placed on people suspected of wrongdoing, adding: "At the moment, we don't have an attorney-general".
Anwar was a senior figure in government and Mahathir's heir-apparent until the pair dramatically fell out.
Anwar, now 70, was jailed again in 2015 during Najib's rule and had been due for release next month.
Mr Anwar, a former deputy prime minister, is serving a prison term for the politically-motivated charge of sodomy.