The US government recommended on Thursday that Saudi Crown Prince Mohammad bin Salman was immune from legal action over the 2018 murder of a dissident journalist, according to court documents.

Prince Mohammad was named prime minister by royal decree in late September, sparking suggestions he was looking to skirt exposure in cases filed in foreign courts — including a civil action brought in the US by Hatice Cengiz, fiancée of slain columnist Jamal Khashoggi.

The killing four years ago of Khashoggi, a Saudi insider-turned-critic, in the kingdom’s Istanbul consulate temporarily turned Prince Mohammad — widely known as MBS — into a pariah in the West.

His lawyers previously argued that he “sits at the apex of Saudi Arabia’s government” and thus qualifies for the kind of immunity US courts afford foreign heads of state and other high-ranking officials.

The US government had until Thursday to offer an opinion on that matter, if it chose to offer one at all. Its recommendation is not binding on the court.

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“The United States respectfully informs the court that defendant Mohammad bin Salman, the prime minister of the Kingdom of Saudi Arabia, is the sitting head of government and, accordingly, is immune from this suit,” read the submission to the US District Court for the District of Columbia, from the administration of US President Joe Biden.

But it added that “the Department of State takes no view on the merits of the present suit and reiterates its unequivocal condemnation of the heinous murder of Jamal Khashoggi”.

The recommendation sparked fury among supporters of Cengiz’s action, including representatives of Democracy for the Arab World Now (DAWN), the US-based NGO that Khashoggi founded.

“The Biden admin went out of its way to recommend immunity for MBS and shield him from accountability,” said DAWN’s executive director Sarah Leah Whitson.

“Now that Biden has declared he’s got total impunity, we can expect MBS’ attacks against people in our country to escalate even further.”

Agnes Callamard, secretary general of Amnesty International, called the recommendation a “deep betrayal”.

Prince Mohammad, who has been the kingdom’s de facto ruler for several years, previously served as deputy prime minister as well as defence minister under his father King Salman.

After a period of relative isolation following the Khashoggi killing, he was welcomed back on the world stage this year, notably by President Biden, who travelled to Saudi Arabia in July despite an earlier pledge to make the kingdom a “pariah”.

Thursday’s recommendation gave the leader “a licence to kill,” said Khalid al-Jabri, son of Saad al-Jabri, a former Saudi spymaster who has accused the prince of sending a hit squad to try to kill him in Canada.

“After breaking its pledge to punish MBS for Khashoggi’s assassination, the Biden administration has not only shielded MBS from accountability in US courts, but rendered him more dangerous than ever with a license to kill more detractors without consequences,” he said.

Last year, Biden declassified an intelligence report that found Prince Mohammad had approved the operation against Khashoggi, an assertion Saudi authorities deny.

In the civil case, brought by Cengiz and DAWN, the plaintiffs allege that Prince Mohammad and more than 20 co-defendants, “acting in a conspiracy and with premeditation, kidnapped, bound, drugged, tortured, and assassinated” Khashoggi, a columnist with the Washington Post.

They seek punitive monetary damages, as well as to prove that the killing was ordered by “the top of the Saudi leadership hierarchy. “