Harris got a huge spike in popularity initially because she was NOT Biden. She then spent the remainder of her campaign explaining how she would be Biden exactly but less old, as well as trying to reach to the right. Her polling steadily trailed off as people realized it would be more of the same. If she had the courage to differentiate herself publicly in any way, (ESPECIALLY with respect to Gaza) we might be having a different conversation.
Obviously to target those that are politically inconvenient to you. Or perhaps as a favor / quid pro quo for one of your rich buddies. Or maybe as revenge for pissing him off. You could pretty much guarantee these scenarios if Trump had this ability. And honestly he doesn’t even need to care about any of it, he just needs some conservative think tank to give him a hit list.