"It is essential that this council address its chronic anti-Israel bias if it is to have any credibility", she said. It also wanted more strict guidelines for membership, as well as the ability to kick out countries with a record of human rights violations.
United States ambassador to the UN Nikki Haley made the announcement at a press conference in Washington. It was not immediately clear if the USA would remain a non-voting observer on the council.
"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".
In the meantime, human rights officials in the United States, alongside businesses and citizens, continue to fight to keep children and their biological parents together during deportation proceedings.
Haley had threatened to withdraw from the council in June 2017 unless it reformed, including by removing its built-in procedural mechanism to bash Israel. She said it's clear those calls for change were not heeded. In the first year, the council's first 11 resolutions targeting a specific nation were aimed at Israel.
The decision, should it come to pass, would occur after months of talks between the US and other member countries, with the USA critical of agenda items singling out Israel for condemnation over its treatment of Palestinians.
Haley has repeatedly attacked the council for its "relentless, pathological campaign" against Israel.
The United States is midway through a three-year term on the council, whose objective is to denounce and investigate human rights abuses.
A full pullout by the USA would leave the council without one of its traditional defenders of human rights. The State Department didn't immediately comment.
"The UN Human Rights Council has always been a problem". Members serve for three-year terms and can serve only two terms in a row.
The Foreign Secretary said the council's work on the Israel-Palestinian conflict could have value, under the right conditions.
It's believed that, up until now, the United States had traded its continued presence in the council for an under the table agreement with the UNHRC that it would hold off on publication of its settlement black list which was due out at the end of past year.
The council last month voted to investigate killings in Gaza and accused Israel of excessive use of force. But he added that the U.K.is not "blind to the value of this council", and advocated for reforming the United Nations body rather than leaving it. The announcement will reportedly happen Tuesday afternoon.
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. In that situation, the United States would be able to speak out on rights abuses, but not to vote.