The Opposition Leader Luke Foley has faced an extraordinary attack in question time over his "white flight" comments and warning that “many Anglo families” were fleeing parts of Sydney.

Question time descended into chaos as the Premier Gladys Berejiklian described Mr Foley's comments as "deeply divisive, dangerous and nasty".

In a fiery question time, Gladys Berejiklian said the NSW Opposition Leader's use of the term was "dangerous and nasty" while Labor tried to interrupt, claiming her remarks were out of order.

"Today he crossed the line, the language used was desperate and inflammatory and it goes to the heart of the type of person he is," a visibly angry Ms Berejiklian said.

In rowdy scenes, Labor MPs took to their feet to criticise the rulings of the deputy speaker, Thomas George, that saw several opposition members ejected from the chamber. Mr Foley remained seated as ministers stood to attack his comments, reported today by News Corp.

The deputy premier John Barilaro, said the government had two leaders from migrant families but warned that Mr Foley had "sunk to the lowest of all" with his views on refugees in western Sydney.

The Treasurer Dominic Perrottet accused Labor of turning into One Nation.

It came after Mr Foley told News Corp that "many Anglo families" had been forced to move because their suburbs had been struggling to cope with the "huge burden" of migration.

Opposition Leader Luke Foley apologised and said he "will not use that phrase again". Cole Bennetts

"I'm particularly concerned about suburbs around Fairfield because they're carrying just a huge burden when it comes to the refugee intake from Syria and Iraq," he told the newspaper.

In a statement released after question time, Mr Foley apologised.

“In the course of a 30-minute interview yesterday I used the phrase white flight," he said.

"That phrase is offensive to many. I apologise and I will not use that phrase again.

"My priority is campaigning for better schools and TAFEs and more good jobs for all the people and communities of Sydney’s West. This is what I will always fight for.”

But many of his MPs were said to be furious that he made the damaging comments.

"There are plenty of us, including those with ethnically-diverse electorates, who could not believe it. MPs are not happy," one senior Labor source said.