Craig Mokhiber, the director of the United Nations's human rights office in New York, has resigned from his position in protest of Israel’s counterattacks in the Gaza Strip, calling it “a text-book case of genocide.”

"The European, ethno-nationalist, settler colonial project in Palestine has entered its final phase, toward the expedited destruction of the last remnants of indigenous Palestinian life in Palestine,” Mokhiber said in a letter to Volker Turk, the U.N. high commissioner for human rights. “What’s more, the governments of the United States, United Kingdom, and much of Europe, are wholly complicit in the horrific assault."

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Mokhiber's resignation is the culmination of a long history of criticism from Jewish groups who have blasted him for his perceived antisemitic and anti-Israel comments. He was accused of antisemitism and "extreme bias" against Israel earlier this year when controversial tweets were exposed by U.N. Watch.

Mokhiber took aim at the U.S. in his resignation letter on Tuesday, stating that key parts of the U.N. have "surrendered" to the "power of the U.S." and therefore abandoned their principles. He said the organization should recognize that the U.S. and other Western nations are not "credible mediators" but rather "active parties" in the conflict and "we must engage them as such."

He recently called the war between Israel and Hamas, the governing body of the Gaza Strip, "the product of decades of Israeli impunity provided by the US & other western governments," as well as "decades of dehumanization of the Palestinian people" by the media.

"We have lost a lot in this abandonment, not least our own global credibility," Mokhiber said. "But the Palestinian people have sustained the biggest losses as a result of our failures."

Mokhiber proposed "ten essential points" in his exit letter, including calling for an end to the two-state solution and ending the "pretense that this is simply a conflict over land and religion between two warring parties." He said the U.N. needs to "admit the reality" that Israel is "colonizing, persecuting, and dispossessing" Palestinians based on their ethnicity.

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Israeli officials are reporting more than 1,400 deaths since the Hamas attacks on Oct. 7, and officials from the Hamas-controlled Gaza Ministry of Health said on Monday that over 8,300 people died in Israeli counterstrikes.

Pro-Palestinian supporters have accused Israel of withholding humanitarian aid to innocent Palestinians trapped in the region. President Joe Biden has implored Israeli Prime Minister Benjamin Netanyahu to allow more protection of Palestinian civilians and allow aid to flow into Gaza, but critics say that would not be enough to address the crisis in the Middle East.