Following the damning allegations by the US Justice Department, Gerakan Youth chief Tan Keng Liang turned the clock back to the Iraq invasion in 2003 in defence of Prime Minister Najib Abdul Razak.
"Those (who) claim US never lies seem to forget what happened to Iraq. CIA claimed Iraq had weapons of mass destruction. Proven false after Iraq was destroyed," he tweeted.
Therefore, Tan cautioned Malaysians against believing the accusations blindly in the absence of evidence.
Referring to the corruption charges against Penang Chief Minister Lim Guan Eng, Tan noted the hypocrisy with regard to the reaction.
"Everyone said Lim must be presumed innocent until proven guilty. But when it concerns BN, we are condemned as guilty before trial. Hypocrisy," he said.
The Gerakan leader also pointed out how Saudi Foreign Minister Adel Al-Jubeir had confirmed the donation to Najib.
"Do you think a Saudi minister would have lied on such matter? Common sense lah," he said.
The US Justice Department had filed lawsuits seeking to seize assets bought with funds allegedly siphoned from 1MDB.
During a press conference, US investigators claimed that Malaysians had been "defrauded on an enormous scale" and implicated Najib's stepson Riza Aziz and businessman Jho Low.
Najib had repeatedly denied abusing public funds for personal gain, blaming such allegations on those conspiring to topple him from power.
Malaysian attorney-general Mohamed Apandi Ali had also cleared the prime minister of any wrongdoing.