The assassination of political rivals by Seal Team 6 is what Trump’s lawyer argued before the Supreme Court. They argued that anything the President orders is an official act, and immunity must apply to it (unless in their bad faith reading of the constitution he was impeached AND convicted by the Senate). But the court also said that if a President is immune, then by this new ruling the Presidents actions cannot be used in court, aka President is above the law without any check in place.