He is resigning in protest and then will spill the beans.
My respect for him would be limitless if he did this.
He will cave. I am a govt contractor and I have been around career civil service people my entire career. Out of several hundred that I know, I only met two that ever defied their bosses. One was demoted and one was forced into early retirement. All others always did exactly what they were told, right or wrong.
He will resign if he is honorable and under pressure to drop the investigation.
If he is honorable, he won’t spill a single bean.
Until he writes a tell-all in 15 years.
One can hope and pray.