\nComment: Abbott's honesty pledge could founder with 'deficit tax'\n A possible new "deficit tax" could be sunk even before it has been officially announced, with Labor, the Greens and the Palmer United Party signalling their opposition to the move. Prime Minister Tony Abbott is considering the introduction of a levy on higher income earners tax in the upcoming May budget, arguing that it would not be a broken election promise because it would only be a temporary measure. In a press conference in Melbourne on Tuesday, Mr Abbott argued that the Coalition was elected to "sort out Labor's debt and deficit mess". But both Labor and the Greens seized on the Prime Minister's comments , flagging their opposition to the idea. Labor leader Bill Shorten described the idea as the "mother" of all broken promises and argued that it was indeed a "tax increase". "No amount of weasel words by Tony Abbott and his Liberal government can change the truth," Mr Shorten told reporters in Bendigo. "A tax increase is a tax increase is a tax increase." When asked if his party would block the proposal in the Senate, Mr Shorten said he would have to wait to see the detail of what was proposed. "But we will fight a tax increase on ordinary Australians," he said. "Labor will have no part of it." Mr Shorten said the government was only testing the idea and would "fold" before the budget on May 13. Greens leader Christine Milne similarly said that her party would not support the proposal. "There is absolutely no way that the Prime Minister should be trying to persuade Australians that the big miners shouldn't have to pay a profits tax but the community should make up the difference," she told reporters in Hobart. "We will not support [Mr Abbott's] deficit levy." Senator Milne explained that her party - and others - would be able to block any deficit levy on its own, rather than oppose the entire budget. "The way that the budget is constructed is that the ordinary annual services of government come through as supply bills but then other pieces of legislation, which are new initiatives ... come through separately and the Senate has the power to block those," she said. Palmer United Party leader Clive Palmer - whose party is due to have four senators, including the PUP-aligned Ricky Muir - also confirmed his opposition to a debt levy to Fairfax Media. "If they're going to bring a debt levy in, that breaks a promise made before the election," he said. "I would have thought that before you have a debt levy, you wouldn't have Direct Action." It is expected that to pass legislation in the new Senate, the Coalition will need six extra votes. Even if all the remaining crossbenchers supported a debt tax, this would only give the government 37 votes. The Australian Electoral Commission is due to announce the result of the WA Senate election on Tuesday at 4pm Canberra time. Independent senator Nick Xenophon said the government would have to clearly demonstrate that a deficit levy would not do more harm to the economy than good. "There is a clear onus on the government to present the need for the deficit tax and demonstrate that it won't have a negative impact on the economy in the short term," he said. He said he would reserve his judgment until he saw the budget. Family First senator-elect Bob Day said "there should be a moratorium on all new taxes". "I'm definitely not supporting it," he said. "We need less taxes, not more – if they need more revenue they should cut taxes."