Thirty US psychiatrists and other doctors specialising in mental health have signed a statement declaring President Donald Trump mentally unfit to serve, warning that his ability to launch nuclear weapons is a “danger” to the world.

The signatories say that Trump’s behaviour over the past year has shown “objectively observable signs of serious medical concern.”

They cited examples of his “marked deterioration in cognitive functioning,” “episodes of apparent somnolence during critical public proceedings,” “severely impaired judgment and impulse control,” and “significant loss of self-control,” as well as “grandiose and delusional beliefs, including assertions of infallibility, imagery of himself as Pope suggestive of a divine mission.”

The doctors called for Trump’s immediate removal from office, arguing that he presents a “clear and present danger” to the whole world.