Firies laws to face High Court challenge

Laws protecting Victorian CFA volunteers engaged in a long-running dispute with the firefighters union will be challenged in the High Court.

Changes to the Fair Work Act passed federal parliament last week as the Turnbull government delivered on its election promise to intervene in the dispute.

United Firefighters Union secretary Peter Marshall has told the Australian Financial Review on Monday the union will launch a constitutional challenge against the laws.

Cabinet minister Mathias Cormann said he was very confident about the government's legislation.

"Some sections of the unions don't know when to give up," he told reporters in Canberra.