U.S. President Donald Trump on Tuesday called former White House aide Omarosa Manigault Newman a ¡°dog¡± and his campaign took legal action against her as the two former reality TV stars escalated their public feud.

The spat came as Manigault Newman, a former contestant on Trump¡¯s ¡°The Apprentice,¡± publicly released more recordings from her time in Trump¡¯s orbit as she promoted her tell-all book, ¡°Unhinged,¡± describing her year at the White House. She was fired in December.

In the book, she accused Trump of making derogatory statements about African-Americans, Filipinos and other minorities, as well as exhibiting ¡°forgetfulness and frustration.¡±