Sen. Marco Rubio announced that he fired his chief of staff after getting reports of “improper conduct” with subordinate staffers.

The statement from Rubio’s office was released Saturday evening. His office did not respond to requests for details on Sunday.

The statement said Rubio had been made aware of “allegations of improper conduct by my Chief of Staff while under the employment of my office,” Rubio wrote.

The announcement made no mention of the chief of staff’s name. However, a press release on Rubio’s website dated December 2016 said identified Clint Reed as Rubio’s newly appointed chief of staff.

Reed managed Rubio’s 2016 re-election campaign to the U.S. Senate as well as Rubio’s presidential primary campaigns in Florida and elsewhere. Reed also served as regional political director for the Republican National Committee and executive director of the Republican Party of Arkansas.