Three dozen medical experts who believe President Donald Trump is “mentally unfit” to perform his duties have had a letter outlining their concerns submitted to the congressional record. The 36 neurologists, psychiatrists and other mental health professionals said in the letter that they had seen “objectively observable” signs of serious medical concerns in Trump, including deterioration of cognitive function, grandiose and delusional beliefs, and severely impaired judgment and impulse control. “Emphasizing that he presents a clear and present danger to our country and to the world,” the letter concludes, “it is our expert opinion that Donald J. Trump is mentally...