"Regrettably, it is now clear that our call for reform was not heeded".
Washington has long accused the council of being biased against Israel.
The US also wanted more stringent criteria for membership and the ability to kick countries that have egregious human rights records off the council, reported CNN. A year ago, she denigrated it as a "forum for politics, hypocrisy and evasion", and threatened a USA exit if the council did not kick out abusive regimes and remove Item 7, the standing resolution critical of Israel's treatment of Palestinians. These included forcing members to vote publicly and a mandate to debate the human-rights situation in Palestinian areas.
The withdrawal, which comes as the 47-member body begins a three-week session in Geneva, had been expected as a result of the Trump administration's frequent criticism of the group's treatment of Israel.
We've made no secret of the fact that the United Kingdom wants to see reform of the Human Rights Council, but we are committed to working to strengthen the Council from within.
A full pullout by the United States would leave the council without one of its traditional defenders of human rights. The United States and Australia cast the only "no" votes.
"Since its creation, the council has adopted more resolutions condemning Israel than against the rest of the world combined". During the first six years the United States was a member, resolutions critical of Israel dropped to one-fifth.
Twelve rights and aid groups, including Human Rights First, Save the Children and CARE, warned Pompeo the US withdrawal would "make it more hard to advance human rights priorities and aid victims of abuse around the world". A group of 12 organizations including Save the Children, Freedom House and the United Nations Association-USA said there were "legitimate concerns" about the council's shortcomings but that none of them warranted a US exit.
The UN Human Rights Council (UNHRC) had mandated the creation of such a list in 2016 and has warned that business activity with Israeli entities over the pre-1967 lines can be considered criminal activity under global law.
The US joined the council in 2009 under President Obama. The State Department didn't immediately comment.
"The UN Human Rights Council has always been a problem".
A key question will be where a US pullout would leave Israel if its biggest and most powerful defender abandons its voting rights or drops out of the council altogether.
During the council's latest session, Zeid Ra'ad al-Hussein, the UN's high commissioner for human rights, launched an attack on the Trump administration's policy of separating families trying to cross the southwest border illegally, calling the practice "unconscionable".
The sources said the decision is in response to what the Trump administration believes to be the group's anti-Israel bias.
Rights groups accused the U.S. of withdrawing from its global obligations to protect human rights.