National Security Advisor John Bolton said the US would do everything to protect her citizens from being prosecuted by the International Criminal Court.
He said, the US government would among other actions; impose sanctions against the court if it goes ahead with prosecutions against Americans.
In a speech in Washington, Mr Bolton said: “If the court comes after us, we will not sit quietly.” Judges and prosecutors with the ICC would be barred from entering the US and their funds in the US would be sanctioned.
“We will prosecute them in the US criminal system. We will do the same for any company or state that assists an ICC investigation of Americans.”
Giving his reasons for opposing the court, Mr Bolton cited the threat to “American sovereignty and US national security”.
He said the ICC lacked checks and balances, claimed “jurisdiction over crimes that have disputed and ambiguous definitions” and failed to “deter and punish atrocity crimes”.
In November 2017, ICC prosecutor Fatou Bensouda called for a full investigation into alleged war crimes in Afghanistan.
She said she had “a reasonable basis to believe” that such crimes had been committed. Alleged possible perpetrators included the CIA, the Taliban and Afghan forces.