The US has been extensively spying on Iraqi Prime Minister Nouri Maliki, a new book by renowned US reporter Bob Woodward claims.
A source in the book is quoted as saying "we know everything he says", according to the Washington Post.
The book also says "ground-breaking" covert techniques have helped reduce the violence in Iraq.
This is the fourth book on the Bush administration by Mr Woodward, the Washington Post's associate editor.
The War Within: A Secret White House History, 2006-2008, examines the handling of the Iraq and Afghanistan wars and President Bush's leadership and governing style, according to the Post.
