Bordering on Wrongful Termination
"Wrongful termination" is a left wing construct.
In a free country, a private business owner should be able to terminate an employee for any reason, or for no reason. The only exception to that principle, of course, would be in cases where there is a formal employment contract which explicitly sets forth the mutually agreed upon procedure for terminating the employee.
When defending ourselves against such knee-jerk anti-Trump bigotry, we must be careful not to rely upon illegitimate shortcuts to redress legitimate grievances.
In this case, therefore, I believe that GrubHub management has every right to terminate employees, just as I would then have every right to never again do business with them, in return for resorting to such a patently vindictive and unwise labor practices.
Firing employees on the sole basis of political ideology is quite extreme, and in most cases ill-advised, of course, but I, for one, am happy to invoke the right of boycott as an acceptable solution to such a development.
Thus, I say simply spread the truth about GrubHub's behavior, express our outrage to the company, launch a passionate boycott, and let the free market decide the rest...