Trump has made the right decision.  People with mental disorders, of which there are many, are routinely disqualified for military service.  Transgenders suffer from “gender dysphoria,” formerly known as “gender identity disorder,” which is classified as a mental disorder by the American Psychiatric Association, so don’t blame me.  The typical conditions suffered by people with gender dysphoria are stress, anxiety and depression, each being a disqualifier for enlisting or commissioning in military services.  Moreover, when such conditions are acquired by military personnel while on active duty, they are normally discharged for being unfit.   It makes no sense to grant an exception to military mental standards to allow a class of people to join the military when people who contract the same mental disorders while on active duty are being discharged as unfit.