As a medical professional-no a psychiatrist- I always hesitate to answer questions about my medical opinion unless I have examined them, their labs etc enough to be certain of a diagnosis. I am not sure that we should lift the Goldwater rule even as I think that Trump IS mentally unfit. I would rather have him be forced by congress to undergo a formal psychiatric evaluation first. If congress is concerned enough to consider a formal article 25 impeachment for mental fitness, then I think it would warrant an objective psych eval be part of that perhaps two evaluations- one by a person picked by president and the other picked by the court or congress. Good luck finding an agreement regarding who that would be.