On Saturday Malaysia declared Ambassador Kang Chol persona non grata and gave him 48 hours to leave the country for failing to issue an apology for his criticism of Malaysia's investigation into the murder.
Kim Jong-Nam, the half-brother of Pyongyang's leader, was poisoned February 13 with the deadly nerve agent VX. North Korea has not acknowledged the dead man's identity but has repeatedly disparaged the murder investigation, accusing Malaysia of conniving with its enemies.
"They should have apologised based on principles, [so] we have declared him persona non grata," added Najib, speaking to reporters after a ceremonial opening of parliament in Kuala Lumpur.
South Korea has blamed the North for the murder, citing what they say was a standing order from leader Kim Jong-Un to kill his exiled half-brother who may have been seen as a potential rival.
The diplomatic spat erupted last month when Malaysian police rejected North Korean diplomats' demands to hand over Kim's body.
Malaysia summoned Kang for a dressing-down, with Najib saying the ambassador's statement was "diplomatically rude".
Malaysia has also recalled its envoy to Pyongyang and cancelled a rare visa-free travel deal with North Korea.
Malaysia issued a February 28 deadline for an apology, which passed and then expelled the ambassador when he failed to present himself at the foreign ministry when summoned on Saturday.
The foreign ministry has said the expulsion is "part of the process by the Malaysian government to review its relations" with North Korea.
With media camped for a third week outside the North Korean embassy, Kuala Lumpur Monday buzzed with speculation on would happen if Kang refused to leave.
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