Three professors of psychiatry have just come forward with a letter directly addressed to President Barack Obama that expresses their concerns that Donald Trump is not mentally healthy enough to be the next President of the United States. The letter was written by Judith Herman, M.D., a professor of psychiatry at Harvard Medical School and two other professors of psychiatry from the University of California, San Francisco. In the letter published by the Huffington Post, the professors stated that they had “grave concern” about Trump’s erratic behavior. They wrote: “We are writing to express our grave concern regarding the mental stability of our President-Elect. Professional standards do not permit us to venture a diagnosis for a public figure whom we have not evaluated personally. His widely reported symptoms of mental instability — including grandiosity, impulsivity, hypersensitivity to slights or criticism, and an apparent inability to distinguish between fantasy and reality — lead us to question his fitness for the immense responsibilities of the office. We strongly recommend that, in preparation for assuming these responsibilities, he receive a full medical and neuropsychiatric evaluation by an impartial team of investigators.” This letter is just a drop in the bucket, as questions about Trump’s mental stability and personality have been raised since the beginning of his presidential campaign and are now becoming increasingly common as he continues to break down under the pressure. The mental states of Trump’s followers have also been questioned. While the American Psychiatric Association has warned that its members should not try to diagnose Trump with mental illnesses from afar, this letter to Obama is stating a perfectly reasonable concern. Trump has acted out in ways that are unprecedented to any presidential candidate or future President of the United States. There is no question that Trump is unqualified to be President based on his lack of experience alone – but further evaluation might prove that it would be unhealthy for him to proceed in leading the country.