Former national security advisor John Bolton's memoir has sent shock waves through US politics as the former aide alleges President Trump isn't "fit for office".
The Trump administration will go to court tomorrow in an effort to halt the publication going on sale.
The new book, The Room Where It Happened, has also caused consternation among Democrats who are angry that Mr Bolton refused to share this information during last year's impeachment investigations.
Washington DC correspondent Simon Marks speaks to Corin Dann.
