 immunity for their official acts. More from ABC's Stephen Portnoy. Chief Justice John Roberts wrote the opinion himself, saying that while a president is not above the law, a chief executive does enjoy absolute immunity for official acts that are core to his constitutional powers. And he's entitled to the presumption of immunity for his other official acts. It's a big win for Donald Trump, who can now engage in a protracted back and forth with prosecutors and judges over whether what he did in the lead up to January 6th was official and off the table for the courts, or unofficial.