the Labor Party's National Broadband Scheme as "critical" to securing his support along with "stability" in government. For his part Oakeshott described his decision as "line ball" and announced that he had secured an undertaking for a "taxation summit" and that Labor's broadband and climate change policies appealed to him. During negotiations, a third ex-National rural MP, Bob Katter, had operated closely with Oakeshott and Windsor, however his support fell behind Tony Abbott, as did West Australian National Tony Crook. Andrew Wilkie also initially backed Julia Gillard as Prime Minister, however her subsequent breaking of a key commitment to him regarding poker-machine reform saw Wilkie withdraw his guarantees on confidence and supply in January 2012. In November 2011, the Gillard government had its Speaker Harry Jenkins resign and installed Liberal-National defector Peter Slipper in the Chair. The manoeuvre was described as "a big win for Gillard" for boosting her numbers on the floor and on 21 January, the government was able to announce that it would not be proceeding with controversial poker machine reform promised by Gillard to independent Andrew Wilkie. In mid-2012, dissent within the ALP organisation over the ALP-Greens coalition become public, with moves by party officials to change election preferencing arrangements with the Greens. Veteran political journalist Paul Kelly described the debate within Labor as "belated recognition that Gillard's 2010 deal with the Greens was one of the worst strategic decisions in the past 50 years of Labor history". In February 2013, Greens leader Christine Milne announced that, while her party would continue to guarantee confidence and supply, the Greens would be ending their alliance with Labor, on the basis that the government was not taxing "big miners" enough via its MRRT mining tax. Craig Thomson and Peter Slipper The government's numbers in the House of Representatives were affected by the resignation of Peter Slipper from the Liberal National Party in order that he could serve as a Labor aligned independent and as Speaker of the House of Representatives; as well as by the eventual suspension of Labor back bencher Craig Thomson from the ALP, who was long the subject of allegations of fraudulent conduct during the Health Services Union expenses affair. Slipper ultimately resigned as Speaker for inappropriate conduct and returned to the cross bench, while police investigations were ongoing in relation to Thomson. Extensive allegations were brought before Fair Work Australia (FWA), concerning mis-use of