And/or they might have some serious 'dirt' on him.
Recall "FileGate".
White House FBI files controversy
The revelations provoked a strong political and press reaction because many of the files covered White House employees from previous Republican administrations, including top presidential advisors.Under criticism, Livingstone resigned from his position.
Allegations were made that senior White House figures, including First Lady Hillary Rodham Clinton, may have requested and read the files for political purposes, and that the First Lady had authorized the hiring of the underqualified Livingstone.”
https://en.wikipedia.org/wiki/White_House_FBI_files_controversy