The US is a signatory on the Rome Statute. Not ratified because the US was guilty of war crimes under Johnson, Reagan, Bush, Clinton, Bush II, and Obama. Not sure about Carter. Bolton was trying to protect his buddies at the Project for a New American Century. Trump can use Military Tribunals to bring the criminals to justice also. Might be why he had the Uniform Code of Military Justice (UCMJ) overhauled.  https://stillnessinthestorm.com/2018/03/new-trump-executive-order-preparation-for-nuremberg-style-tribunals/