New South Wales Parliament has formally branded US presidential candidate Donald Trump a "revolting slug" who is unfit for office.

Greens MP Jeremy Buckhingham tabled a motion on the business paper slamming the Republican, which passed unopposed on Thursday morning.

It said Parliament condemned the "misogynistic, hateful comments made by the Republican candidate for President of the United States of America, Mr Donald Trump, about women and minorities".

It said the taped conversations in which Mr Trump boasted about using his fame to allowed him to grope women "clearly describe sexual assault".

And it said the Parliament "agrees with those who have described Mr Trump as 'a revolting slug' unfit for public office".

Motions on the business paper are routinely passed in the Upper House, unless someone objects.

The motion regarding Mr Trump was passed without dissent, after Upper House president Don Harwin looked into whether the term "revolting slug" amounted to unparliamentary language.

"It is great that all sides of Australian politics, from conservatives to Liberals to Greens, agree that Donald Trump is a revolting slug and completely unfit for public office," Mr Buckingham said after the vote was passed.

"It's clear that all reasonable and decent people find Donald Trump's behaviour obnoxious and that the world is hoping American voters reject his politics of hate."

US talkshow host Rosie O'Donnell, who has a long-running public feud with Mr Trump, has previously described him as "an orange slug".