Tiffany Trump Denies 'Dangerously Close' Relationship With Secret Service Agent Claims KEY POINTS A spokesperson for Trump said her "experience with the Secret Service was entirely professional" A journalist claimed in her book that Tiffany and Vanessa Trump had inappropriate relationships with Secret Service agents Tiffany Trump has denied the claims in a new book that she and Vanessa Trump got inappropriately close to Secret Service agents. Washington Post reporter Carol Leonnig's new book, "Zero Fail: The Rise and Fall of the Secret Service," is debuting next week, but it is now making headlines due to the Pulitzer Prize-winning journalist's claims that former President Donald Trump's youngest daughter and Donald Trump Jr.'s ex-wife Vanessa became "inappropriately — and perhaps dangerously — close to members of the security detail." International Business Times could not verify the claims in the book.