President Trump earned a perfect score on a medical test that is used to detect early signs of dementia or Alzheimer's disease. The test, called the Montreal Cognitive Assessment, was conducted during his routine physical on Friday, at the insistence of the president, who wanted to tamp down rumors about his mental abilities that have surfaced from his critics. Dr. Ronny Jackson, the White House doctor who conducted the exam, said that he did not believe it was necessary because he hadn't noticed any issues with Trump's memory after spending the past year with him. The doctor's quarters are in...