I searched high and low for a job description for a NYPD deputy commissioner but did not find anything.
But I bet dollars to donuts he is in charge of any investigations dealing with the mayor. Since he is charge of the mayor’s security then he will have complete knowledge of any public or internal NYPD ‘threats’ pertaining to the mayor.
“But I bet dollars to donuts”
A donut shop recently opened in my neighborhood. Donuts are 4 bucks each. You might need to revise your bet.