<sod >NSCÃÂ spokesman Michael Anton also stepped down days earlier, in a move widely seen as a response to Mr Bolton's arrival.< eod>< sod > A White House official said Rob Joyce, the currentÃÂ NSCÃÂ cybersecurity coordinator, would take MrÃÂ BossertÃ¢ÂÂs place on an acting basis, according to theÃÂ New York Times NSCÃÂ spokesman Michael Anton also stepped down days earlier, in a move widely seen as a response to Mr Bolton's arrival.< eod>