From time to time there has been debate over repealing the clause that prevents Roman Catholics, or those who marry one, from ascending to the British throne. Proponents of repeal argue that the clause is a bigoted anachronism; Cardinal Winning, who was leader of the Roman Catholic Church in Scotland, called the act an "insult" to Catholics. Cardinal Murphy-O'Connor, the leader of the Roman Catholic Church in England, pointed out that Prince William (later the Duke of Cambridge) "can marry by law a Hindu, a Buddhist, anyone, but not a Roman Catholic." Opponents of repeal, such as Enoch Powell and Adrian Hilton, believe that it would lead to the disestablishment of the Church of England as the state religion if a Roman Catholic were to come to the throne. They also note that the monarch must swear to defend the faith and be a member of the Anglican Communion, but that a Roman Catholic monarch would, like all Roman Catholics, owe allegiance to the Pope. This would, according to opponents of repeal, amount to a loss of sovereignty for the Anglican Church.