Are US presidents copyrighted or considered public domain? Video game idea

Current Events

I had a similar idea to this, some time after the 2016 election.

The plot involved time travel (but of course), with Hilary Clinton from an alternate timeline where she won the 2016 election as part of the roster, and the main villain was an extraterrestrial President from the far future who is trying to take over all of time.
"Be good to yourself, because everyone else in the world is probably out to get you." - Dr. Harleen Quinzel