Pretty sure it's a conflict of interest if they're representing someone guilty of the same crime they're guilty of (or at least guilty of facilitating), given that they won't be acting as an an independent representative. They're essentially defending themselves without stating as such, and are more likely to lie/cheat/steal to get an acquittal.
It's like Bruce Cutler-
When Gotti was indicted in 1990 for the 1985 murder of Paul Castellano and several other crimes, presiding judge I. Leo Glasser disqualified Cutler and two associates from representing Gotti. Citing evidence from wiretaps at Gotti's Ravenite club, prosecutors contended that Cutler and his colleagues may have known about criminal activity. Since the attorney-client privilege does not apply in these circumstances, prosecutors argued that Cutler was "part of the evidence" and thus liable to be called as a witness. They also argued that Cutler had represented other potential witnesses and thus had a conflict of interest. Glasser sided with the prosecutors, contending that Cutler was the "in-house counsel" for the Gambino family.
Bruce Cutler - Wikipedia
Cippolone is the in house counsel for the Trump/GOP crime family & McConnell is their guy in the Senate, their Caporegime.
