Donald Trump, while president, was impersonated by thousands of people as comedy acts. Some people even had full time gigs doing it!
It’s not a illegal when you are doing it for comedy. Pretending to actually be someone who you are not, is fraud, but that’s not what we’re talking about.
Mimicking someone’s voice or putting on a costume in their likenesses doesn’t make it illegal.
If it did, then Elvis impersonator festivals would be a mass crime gathering!