The NY Daily News:

After his latest spasm of deranged tweets, only those completely under his spell can deny what growing numbers of Americans have long suspected: The President of the United States is profoundly unstable. He is mad. He is, by any honest layman’s definition, mentally unwell and viciously lashing out.

….But Occam’s razor, and the sheer strangeness of Trump’s behavior, leads us to conclude that we are witnessing signs of mania.