the government decided to postpone its ETS until 2013, a decision which saw Labor lose some electoral support to the Greens. The government also lost some public support when it proposed a Resources Super Profits Tax following the release of the Henry Tax Review in May 2010. The resulting media campaign against the tax by the mining industry particularly affected Labor's support in the resource-rich states of Queensland and Western Australia. Illegal immigration policy proved another difficult issue for the government, which initially closed the Nauru processing centre, abolished temporary protection visas and took measures to improve the legal rights and processing time for applicants for asylum. However, unauthorised arrivals by boat increased sharply from 2009 and the number in mandatory detention stretched capacity. The new leader of the Opposition, Tony Abbot, promised that a Coalition government would "stop the boats." In June 2010, with the government behind the Opposition in polls and Rudd's popularity rating falling, the Labor caucus replaced Rudd with Gillard as leader. The new leader was able to negotiate concessions on a new mining tax with large mining companies but failed to reach agreement with East Timor on a proposed migration processing centre there. Following the September 2010 election, the Gillard Government passed a series of legislation with the support of the Greens who now held the balance of power in the Senate. This included enabling legislation for a National Broadband Network, a carbon pricing scheme, a mining tax, a National Disability Insurance Scheme, and school funding reforms. Illegal immigration policy, however, remained a politically sensitive issue. The government negotiated an agreement with Malaysia to process some people there but the plan did not gain the support of the Opposition or the Greens and was struck down by the High Court. As the number of unauthorised immigrants arriving by boat continued to climb, the government reopened offshore processing centres on Manus Island and Nauru. In Indigenous affairs, the government introduced, in 2012, a modified policy in the Northern Territory ('Stronger Futures in the Northern Territory') under a 10-year funding agreement. The new policy retained many features of the Northern Territory Intervention but was broader in scope and involved more collaboration with Indigenous stakeholders. Following mounting leadership speculation and poor polling for the government, Rudd defeated Gillard in a leadership ballot in June 2013 and returned as Prime Minister, promising to replace the carbon tax with an