"A group of medical experts who claim that President Trump's mental health makes him dangerous and unfit for office is seeking to testify during House impeachment proceedings.

"The group, comprising four psychiatrists, a clinical neuropsychologist, a neurologist, and an internist, are planning to announce their availability next week to members of Congress and the media. They'll also be available to consult privately with members of Congress, with 2020 Democratic presidential candidates, or with members of Trump's cabinet."