The president stated that the ICC had demonstrated "brazen ignorance of the law" and due to its alleged fraudulent implication in the Philippines, the Rome Statute was null and could not, therefore, be enforced.
President Rodrigo Duterte announced Wednesday that the Philippines is withdrawing its ratification of a treaty that created the International Criminal Court, where he is facing a possible complaint over thousands of suspects killed in his anti-drug crackdown.
But according to Mr Duterte's spokesman, Harry Roque, that examination "violates the very fundamental basis by which we gave our consent to be bound by the ICC".
Duterte also said that the accusations and statements of United Nations (UN) special rapporteur Agnes Callamard and the High Commissioner on Human Rights Zaid Ra'ad al-Hussein shows "international bias" and the refusal of global community to support the country's "legitimate efforts and self-determination, nation building and independence from foreign influence and control".
In February the International Criminal Court (ICC) officially announced it was launching a preliminary investigation into the Duterte administration's war on drugs.
"Well, the political NGOs and politicians have taken over human rights while in the past it was the principle of human rights".
While in theory withdrawal would not stop the court's inquiry into alleged crimes committed while the Philippines was a member, it could prove hard to make local authorities co-operate. Because you have shown that you can exercise your power without accountability.
President Duterte's latest pronouncement might have damned him more as he might have unwittingly displayed his guilt over the crimes he stands accused of, Hontiveros said.
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Roque, who was a prominent advocate for the Philippines' joining the ICC in 2011, said he was saddened by the President's decision but he supports Duterte's move.
In a January report, Human Rights Watch said Duterte's "war on drugs" has led to the deaths of over 12,000 Filipinos, mostly urban poor. "There is no hiding from the ICC, Mr. President.", she added.
"The government affirms its commitment to fight against impunity for atrocity crimes, notwithstanding its withdrawal from the Rome Statute, especially since the Philippines has a national legislation punishing atrocity crimes", the letter said.
Duterte, known for his tough language, previously said he was ready to face the ICC and answer all the allegations against him. He added that he already brought this matter up before the ICC but it paid no heed to him. How could it counter the criticisms that the war on drugs is mainly targeting the poor?
He warned that summary killings related to the war against drugs will continue unabated because "with the ICC kicked out, there will be no more major independent monitors or censors to rein in or guard against atrocities with imposable sanctions".
Under the treaty, withdrawal is only effective one year after a country gives written notice of its decision to the United Nations secretary-general. "Detaching from the Rome Statute is abandoning a global bastion for the protection of human rights", Lagman said.
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