Trump does not have a Gab account. Gab (and Parler) set up an account a long time ago to copy Trump's tweets, and now also copies the press releases from Trump's Save America PAC without noting where they actually came from. The home page for the account makes clear that it's not his account, but the pages for individual messages do not make this clear. It's misleading and wrong, intended to drive traffic to Gab by making people think it's actually Trump's account.