US President Donald Trump has reacted to accusations that he's mentally unfit for office, describing himself as a "stable genius".
It follows publication of Fire and Fury - a book that questions Trump's ability to do his job and claims his staff view him as infantile.
Trump's latest attacks on author Michael Wolff have again overshadowed his policy agenda.
The book has driven a wedge between Trump and his onetime close adviser, Steve Bannon.
Al Jazeera's John Hendren reports from Washington.
