Shared Top Secret materials with the biographist.
That’s what they nailed him on, not banging a groupie.
I’d say that’s betrayal of his oath of office.
But hey that’s just me.
Actually, he was doing both, sleeping with her AND leaking classified material.
He resigned over the affair and years later pleaded guilty to the leaks.
Since he betrayed what should have been the most important oath of his life (his wedding vows), it’s no surprise he cared little of his oath to his country.