2015 Labour leadership election, Unite and McCluskey supported Jeremy Corbyn's candidacy, later reasserted by McCluskey when some senior figures in the union wanted to support Andy Burnham. According to George Eaton of the New Statesman, McCluskey was thought privately to share this view (which was denied by McCluskey, who was always a Corbyn supporter). Office space was supplied to Corbyn's campaign and by March 2018, Unite had donated £11 million to the Labour Party since Corbyn became leader. McCluskey later termed the events of June and July 2016 concerning Corbyn's leadership of the Labour Party as a "crazy vote of no confidence, this mass resignation" and "this coup attempt" in an interview with Decca Aitkenhead of The Guardian. 2017 re-election as General Secretary In December 2016, McCluskey resigned as General Secretary and stood again in a leadership election. McCluskey's main challenger was Gerard Coyne, then Unite's organiser in the West Midlands. McCluskey was re-elected in April 2017 by less than 6,000 votes over Coyne; 59,067 votes (45.4 per cent) to Coyne's 53,544 (41.5 per cent) on a turnout of 12.2 per cent. The other candidate was Ian Allinson who received 17,143 votes (13.1 per cent). An investigation into Coyne's actions during the election, led by Andrew Murray, the union's chief of staff, resulted in Coyne being fired for the misuse of data in June 2017. Coyne's subsequent complaint to the Trades Union Certification Officer was dismissed on all ten counts, and the officer found that Coyne had included misleading information in some of his election literature. His first book, Why You Should Be a Trade Unionist, was published in 2020. His successor as General Secretary, Sharon Graham, was elected on 25 August 2021. In January 2021, Unite's executive counsel convened to discuss cost overruns on a union-funded building project undertaken by Paul Flanagan, a close personal associate of McCluskey; the construction works, which were originally supposed to cost £7 million pounds, had reached a cost of £96.5 million by January 2021, with an estimated £15 million in profits accruing to Flanagan. In December 2021, Sharon Graham announced an independent inquiry into the project. In February 2022, it was revealed that independent valuations of the completed building project, which includes a hotel, a conference center, and Unite's regional offices, came in at between £27 and £29 million pounds, roughly £70 million less than the project's cost of just under £100 million.