“He would say things similar to that on occasions to blow off steam. But I wouldn’t take them literally every time he did it,” Mr Barr said, adding: “At the end of the day, it wouldn’t be carried out and you could talk sense into him.”
So either we're counting on people to refuse the president's orders, or we're hoping the Trump is more mature than he lets on?
How about not electing people who would even entertain such an idea in the first place?
The building manager should (and may be legally required to) have a fire department approved emergency plan that specifically addresses this question. Usually, the plan will be for you to await rescue.
A modern, up-to-code high rise building will have designated "places of refuge" that are designed to withstand heat and smoke, such as a pressurized stairwell with fire doors. In older buildings that don't have something like that, the plan might call for disabled people to go to the nearest (unprotected) stairway, or it might call for them to remain in their office/apartment and "defend in place". If possible, call 911 (or equivalent) to notify rescuers of your location.