President Donald Trump tore into his niece Mary Trump after days of silence about her latest work.
Her recently published book is critical of the President and his family reports CNN.
Trump is calling her "a mess" and alleging she wrote "untruthful things."
The tell-all book is "Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man."
It went on sale Tuesday and portrays the President in an unflattering light.
In the series of tweets Friday, Trump also called his former national security adviser a "lowlife dummy."
