Donald Trump Falsely Claims Taylor Swift’s Endorsement with Garbage AI-Generated Posts

The Democratic national convention this week would be an opportune time

Maybe, since it was inevitable anyway, that's his goal. Otherwise, you'd get the Convention bump, and later when attention was back on him again you could have the Swift Bump. This way it's all at once and he can try to take the spotlight again after. Not saying it's a smart strategy, but it could be on purpose.