Niels Wittich has near his relation arsenic Formula 1's contention manager with contiguous effect.
The German, who had been successful the relation since 2022, "has stepped down from his presumption to prosecute caller opportunities," the FIA said successful a connection to BBC Sport.
He volition beryllium replaced from the adjacent contention successful Las Vegas by Rui Marques, astir precocious the contention manager for Formula 2 and 3.
The astonishment determination has happened quickly. FIA unit were told earlier connected Tuesday, BBC Sport has been told.