Washington (CNN) President Donald Trump claimed he's suing "various people" who worked for him for violating their confidentiality agreements -- a threat he's often made -- after Thursday's departure of Madeleine Westerhout, one of his longtime aides.

Trump said Saturday that he sued several individuals, including his former campaign aide and White House official Omarosa Manigault Newman, who published a tell-all book last year about her time working for Trump.

"Yes, I am currently suing various people for violating their confidentiality agreements," Trump wrote on Twitter Saturday. "Disgusting and foul mouthed Omarosa is one. I gave her every break, despite the fact that she was despised by everyone, and she went for some cheap money from a book. Numerous others also!"

CNN has reached out to the White House for comment.

When asked about the President's tweet Saturday that he is "suing various people for violating their confidentiality agreements," a person familiar with the matter says there are several "legal proceedings" dating back to Trump's 2016 presidential campaign but would not specify how many. The source noted that if there aren't public lawsuits, they are arbitration proceedings.