The Senate has today blocked the repeal of the Minerals Resource Rent Tax, to help ensure communities continue to benefit from the extraction of Australia's natural resources.

Greens Leader Senator Christine Milne says the Mining Tax repeal was just another item on the Abbott government's destructive agenda, and a blatant favour to the Prime Minister's big business mates.

"Who would this repeal serve?" asked Senator Milne. "Not the people of Australia, but the most profitable mining companies.

Greens Leader Christine Milne says Clive Palmer's backflip on supporting the Renewable Energy Target on ABC's RN Breakfast this morning shows the Palmer political party cannot be trusted and will say and do anything on a whim.

"The Palmer political party is saying whatever it thinks it needs to for electoral gain. This backflip is disgraceful and will sound the alarm not only in Western Australia but with everyone who supports renewable energy," Senator Milne said.