In the majority's opinion they stated that any act carved out by the constitution for the president is an official one.
The constitution establishes the president as the commander in chief of the armed forces. If the president orders a member of the military to assassinate an individual, he's exercising his role as the commander in chief, an official act, and is thus criminally immune.
The slightly longer form also includes that the majority held that for official acts, a president's motives can't be probed by the courts, so whether the president ordered Seal Team 6 to murder a political rival for self-interested reasons, that it was an official act is the only thing that need be considered.
In the majority's opinion they stated that any act carved out by the constitution for the president is an official one.
The constitution establishes the president as the commander in chief of the armed forces. If the president orders a member of the military to assassinate an individual, he's exercising his role as the commander in chief, an official act, and is thus criminally immune.
The slightly longer form also includes that the majority held that for official acts, a president's motives can't be probed by the courts, so whether the president ordered Seal Team 6 to murder a political rival for self-interested reasons, that it was an official act is the only thing that need be considered.