Trepass threat for 'legal rape' supporters

Members of a group that advocates for legal rape will be trespassing if they meet at a public square in Melbourne's CBD, the Lord Mayor says.

While noting the importance of freedom of speech, councillor Robert Doyle said the "abhorrent, vile" Return of Kings group crosses the line and would not be granted access to council-owned areas.

"We could declare that trespass if they tried to use City Square - and we would," Mr Doyle told ABC radio on Wednesday.