Problem with you uneducated people is that you literally do not understand any science except what is spoon fed to you by the media. Yes Trump is immune, for a few weeks, because he has developed antibodies to fight the virus. This is the very same protection that a vaccine provides.
The problem is only that the antibodies for SARS-CoV-2 are typically short lasting (only a lasting a few weeks to a few months) for those with a fast recovery, not that they do not provide protection against reinfection.
It really should be noted that "immunity" isn't the Hollywood standard where a magical force-field prevents the virus from entering your body. I find it hilarious how people don't recognize that a vaccine does not prevent a virus from entering your body, it merely gives you the tools to fight it off. The same goes for SARS-CoV-2... the whole idea is that you remain asymptomatic while infected regardless of how you acquire the immunity.