Luttig is patently wrong when he repeatedly claims there's no role for the President in elections.
If necessary, the President can and should order the DoJ and even the National Guard to investigate and protect elections when they are under assault by states or other bad actors.
That's happened. And usually with good justification, as during the recent era when America finally started to take civil rights seriously.
Needless to say, Trump was not acting in this commendable presidential capacity when he tried to get states to change counts, or when he backed fake electors, or when he encouraged his supporters to block the rightful transfer of power. But that doesn't mean a President cannot act in proper ways to protect the electoral process. It just means that Trump can't hide behind those defenses - because he was not acting in proper ways, nor was he acting to correct wrongdoing.