He obviously didn’t read the 5-page letter the President’s counsel sent to the Waddler.
Napolitano’s argument is basically Trump’s lawyers should lend credibility and legitimacy to a sham process intended to indict the President while depriving him of due process and the basic presumption of innocence.
If it was Napolitano himself under the gun, you can bet your tuchis he wouldn’t send HIS own lawyers there.