The Royal Court has heard that one of Jersey's most senior politicians slapped a woman across the face and kicked her in the side of the head.
Senator Alan Breckon, 59, is alleged to have assaulted Suzette Hase, 44, at his home in St Brelade in April.
The prosecution claim Senator Breckon and Miss Hase had a close friendship but that Senator Breckon wanted it to become a sexual relationship.
They say on the night in question Miss Hase refused his advances and it ended in violence.
Senator Breckon denies grave and criminal assault.
The trial is expected to last three days.