"The Mahathir regime's illegal act today, ignoring court rulings in legal proceedings in the US and Indonesia, prove he has no interest in a fair and just process", he said in a statement Monday.
Najib said the KSCIP was the brainchild of Saudi King Salman Abdulaziz Al Saud and that the Malaysian government when he was Prime Minister welcomed the setting up of the centre as it was deemed to be good for both countries.
Malaysia's new government has shut down a Saudi-backed anti-terrorism center, just over a year after it was launched by the kingdom's ruling monarch during a visit here last year.
The Equanimity is expected to arrive at Port Klang on Pulau Indah, Selangor today, according to news reports, after Indonesian and Malaysian authorities reached an agreement and conducted the handover of the yacht in Batam.
Former prime minister Datuk Seri Najib Abdul Razak says he has no knowledge on whether the Equanimity super yacht was purchased using funds from 1Malaysia Development Berhad (1MDB).
'Mission: Impossible -- Fallout' No. 1 movie for 2nd weekend
Cruise's next mission: Fight off Jason Statham and a prehistoric shark in " The Meg " next weekend to keep the box office crown. Another A24 title, "Never Goin' Back", opened with US$10,000 on just two screens.
In a video clip, Dr Mahathir also said that if there were any parties who claimed that the yacht belonged to them, they must show proof.
After questioning Najib Tuesday for 45 minutes, the anti-graft agency said he would be charged under the anti-money laundering law in relation to SRC International, an energy company that used to be a subsidiary of 1MDB. MACC and Najib's spokesman did not respond to a request for comment.
Malaysian and worldwide authorities want to question Malaysian financier Low Taek Jho, who the Justice Department alleges was a key figure in the theft and global laundering of $4.5 billion from 1MDB.
Finance Minister Lim Guan Eng told reporters the government planned to take inventory of items one the yacht and open the vessel for public viewing, before eventually selling it "at the highest price". Najib, who set up and oversaw 1MDB, denies any wrongdoing.
Lim said Malaysia's attorney-general was expected to issue a statement on Tuesday regarding the status of the yacht and address concerns that it could affect investigations by the United States Department of Justice (DoJ).