The Scottish Government has vowed to "vigorously contest" any legal challenge from Westminster over its gender reform plans.
Shona Robison, the social justice secretary, flatly rejected claims from the UK Government that the Gender Recognition Reform (GRR) Bill could negatively impact UK-wide equalities laws.
MSPs from all parties voted to pass the controversial legislation by 86 votes to 39 on Thursday after three days of intense debate and protests outside Holyrood.