Republicans will protect him from any referendums regarding his fitness to be president. They don't care about his crimes, gaffes, lapses in logic, childish outbursts, anti-intellectualism, open racism, hate, stochastic terrorism, boorishness, fascist tendencies, Russian asset-like behaviors, or antidemocratic coups. They sure as shit won't care about this.
Trump himself has threatened to start WWIII with nuclear missiles over twitter on more than one occasion, and often floated assassinations of high-ranking members of nuclear states like Iran.