Democrats are planning to host a Capitol Hill event featuring psychiatrists who will warn that President Trump is unfit for office based on his mental health.

The event will be led by Dr. Bandy Lee, a Yale School of Medicine psychiatrist and editor of The Dangerous Case of Donald Trump, a book that argues psychiatrists have a responsibility to warn the public when a president is dangerous. The position is controversial because psychiatric associations urge members never to diagnose patients they haven’t personally evaluated, saying it undermines the scientific rigor of the profession.