as his attorney.
See the John Gotti trial for an example... the SDNY prosecutor got Gotti's attorneys disqualified by claiming they were potential witnesses of the alleged crimes and could be called to testify. But this SDNY prosecutor failed to do that in this case?
https://www.nytimes.com/1991/07/27/nyregion/judge-disqualifies-gotti-s-lawyer-from-representing-him-at-trial.html