emissions trading scheme and to ensure that people arriving without authority by boat would not be settled in Australia. The Opposition, promising to "stop the boats," abolish the carbon tax and mining tax, and reduce the Budget deficit and government debt, won the September 2013 election. Liberal-National Coalition Governments: (2013–2022) The return of the Liberal-National Coalition to power after six years in opposition initially failed to restore stability to the office of prime minister. Prime Minister Tony Abbott's rival Malcolm Turnbull challenged for and won the leadership of the Liberals within Abbott's first term. After Turnbull narrowly returned the Coalition to office in 2016, Party dissatisfaction with his leadership saw him replaced by Scott Morrison in 2018. Abbott Government (2013–2015) Prime Minister Tony Abbott's Liberal-National Coalition Government began implementing its policies on unauthorised maritime arrivals, including Operation Sovereign Borders, boat turnbacks, the reintroduction of temporary protection visas, and the resettlement in third countries of those found to be refugees. The new policy strained relations with Indonesia, but the number of people arriving by boat fell from 20,587 in 2013 to none in 2015. The government continued Australia's economic engagement with Asia, signing trade agreements with China, South Korea and Japan. The government also embraced the intervention against Islamic State in Iraq and Syria, joining the air campaign, sending special forces and providing training for the Iraqi army. The government made cuts to Indigenous programs, brought the Indigenous Affairs portfolio into the Cabinet, and established the Indigenous Advisory Council. The government's May 2014 Budget, which included measures such as the deregulation of university fees, welfare cuts and projected cuts to funding to the states for health and education, proved unpopular, with the perception that it had involved breaking a number of election promises. The government secured the passage of legislation abolishing the carbon tax (July 2014) and the mining tax (September 2014). The Prime Minister announced a number of decisions – most notably the reintroduction of knighthoods and a knighthood for Prince Philip, Duke of Edinburgh – which had not been approved by cabinet and which were widely criticised in the media. By September 2015 the government had lost 30 Newspolls in a row and Malcolm Turnbull successfully challenged for the leadership. Turnbull Government (2015–2018) The new Turnbull government promised to promote a "smart, agile and innovative Australia" and "jobs and growth". The government announced a National Innovation and Science Agenda