It's a conflict of interest.

Meaning

There's a clash between personal and professional interests.

Examples

• John: He's judging the competition his own company entered.
• Alice: That's a problem. <b>It's a conflict of interest</b>.
• John: It could lead to unfair judging.
• Alice: He should recuse himself. <b>It's a conflict of interest</b> that cannot be ignored.