Greens Treasury spokesperson Adam Bandt MP says the Greens will fight the government's plan to push up the goods and services tax.
"The Greens will fight tooth and nail to stop any GST increase," Mr Bandt said.
"The last 24 hours have confirmed what we have feared for some time. Malcolm Turnbull is testing the waters to see how far he can hike up this regressive tax."
"We accept the Budget has a revenue problem, but there are better ways to raise revenue, such as removing unfair tax breaks for big polluters and the very wealthy."