The claim is that we are withdrawing to support Israel...
Of course the real reason is they are withdrawing before the backlash from what we are doing to children on the border... and because of the atrocities they plan to do next...

https://www.washingtonpost.com/world/national-security/us-expected-to-back-away-from-un-human-rights-council/2018/06/19/a49c2d0c-733c-11e8-b4b7-308400242c2e_story.html?utm_term=.8b753aa21ea6

The Trump administration withdrew from the United Nations Human Rights Council on Tuesday in protest of what it perceives as an entrenched bias against Israel and a willingness to allow notorious human rights abusers as members.

U.N. Ambassador Nikki Haley, who has sought major changes on the council throughout her tenure, issued a blistering critique of the panel, saying it had grown more callous over the past year and become a “protector of human rights abusers, and a cesspool of political bias.” She cited the admission of Congo as a member even as mass graves were being discovered there, and the failure to address human rights abuses in Venezuela and Iran.

“I want to make it crystal clear that this step is not a retreat from our human rights commitments,” she said during a joint appearance with Secretary of State Mike Pompeo at the department. “On the contrary. We take this step because our commitment does not allow us to remain a part of a hypocritical and self-serving organization that makes a mockery of human rights.”

Haley accused governments with woeful human rights records of seeking a seat on the council to avoid scrutiny and then resisting proposals for reform.

“When we made it clear we would strongly pursue Council reform, these countries came out of the woodwork to oppose it,” she said. “Russia, China, Cuba, and Egypt all attempted to undermine our reform efforts this past year.”

The decision to leave the 47-nation body was more definitive than the lesser option of staying on as a nonvoting observer. It represents another retreat by the Trump administration from international groups and agreements whose policies it deems out of sync with American interests on trade, defense, climate change and, now, human rights. And it leaves the council without the United States playing a key role in promoting human rights around the world.

The United States is midway through a three-year term on the council, whose purpose is to denounce and investigate human rights abuses. A U.S. departure deprives Israel of its chief defender at a forum where Israel’s human rights record comes up for discussion at every single meeting, a standing “Item 7” on the agenda.

“By withdrawing from the council, we lose our leverage and allow the council’s bad actors to follow their worst impulses unchecked — including running roughshod over Israel,” said Eliot L. Engel (D-NY), the top Democrat on the House committee that oversees the State Department.

“However, this Administration’s approach when it sees a problem is to take the United States off the field,” he added. “That undermines our standing in the world and allows our adversaries to fill the void.”