The United Nations has warned that Washington is setting a "dangerous precedent" by imposing sanctions on a UN expert for criticizing US policy on Gaza and called for the cancellation of the action.

UN rights chief Volker Turk also called for a halt to "attacks and threats" against people appointed by the UN and international institutions like the International Criminal Court, whose judges have also been hit with US sanctions.

"I urge the prompt reversal of US sanctions against a special rapporteur of the UN Human Rights Council, Francesca Albanese, in response to work she has undertaken under the mandate on the situation of human rights in the occupied Palestinian territory," Turk said in a statement on Thursday.

UN chief Antonio Guterres's spokesman meanwhile insisted that "the imposition of sanctions on special rapporteurs is a dangerous precedent".

The use of unilateral sanctions against any UN expert or official "is unacceptable", spokesman Stephane Dujarric told reporters in New York.

US Secretary of State Marco Rubio on Wednesday announced that Washington was sanctioning the outspoken Albanese "for her illegitimate and shameful efforts to prompt [ICC] action against US and Israeli officials, companies and executives".

Albanese said the sanctions were "calculated to weaken my mission".

"I will continue to do what I have to do," she told reporters during a visit to Slovenia.

No details have been given on the nature of the sanctions.

'Genocide'

Rubio slammed the UN expert's criticism of the US and said she recommended to the ICC that arrest warrants be issued against Israel's Prime Minister Benjamin Netanyahu. Arrest warrants for Netanyahu and Yoav Gallant, former Minister of Defense, were issued following their indictment for the war crime of starvation as a method of warfare, among other charges.

Rubio, whose country has boycotted the UN rights council since shortly after President Donald Trump returned to power in January, also accused Albanese of "biased and malicious activities" and accused her of having "spewed unabashed antisemitism [and] support for terrorism".

"We will not tolerate these campaigns of political and economic warfare, which threaten our national interests and sovereignty," Rubio said.

Albanese has faced harsh criticism by Israel and some of its allies over her relentless criticism and long-standing accusations that Israel is committing "genocide" in Gaza, a charge agreed upon by an increasing number of legal scholars.

The Italian-born expert, who assumed her mandate in 2022, released a damning report this month denouncing companies, many of them American, that she said "profited from the Israeli economy of illegal occupation, apartheid and now genocide" in the occupied Palestinian territories.

The report provoked a furious Israeli response, while some of the companies also raised objections.

Washington last month slapped sanctions on four ICC judges, in part over the court's arrest warrant for Netanyahu, barring them from the US.

UN special rapporteurs like Albanese are independent experts who are appointed by the UN rights council but do not speak on behalf of the UN.

'Attacks and threats'

The current rights council president, Swiss ambassador Jurg Lauber, also decried the sanctions in a statement.

He urged UN member states to "fully cooperate with the special rapporteurs and mandate holders of the council and to refrain from any acts of intimidation or reprisal against them".

Turk said rapporteurs worked on "sensitive and often divisive issues that are of international concern" and urged member states to avoid using "punitive measures".

Israel on Wednesday commended Rubio's action against the rapporteur.

On Thursday, Prime Minister Benjamin Netanyahu said Israel was ready to negotiate a lasting deal with Hamas to end the Gaza war when a temporary halt to hostilities begins.