In her final report on 29 May, Schippers recommended Herman Tjeenk Willink as the next informateur.[25] He was subsequently appointed the next day,[26] and attempted to continue negotiations including GroenLinks before collapsing on 12 June.[27] With it becoming clear that the only possible fourth coalition partner would be Christian Union, Tjeenk Willink submitted his final report on 27 June as negotiations with CU began, recommending Gerrit Zalm as the next informateur.[28] On 9 October, the parties announced that they had concluded a provisional coalition agreement for the new cabinet.[29] Zalm presented his final report on 10 October, which was approved by the four parliamentary parties,[30] and Mark Rutte was appointed as formateur on 12 October, promising a cabinet by 26 October.[31] The Rutte III cabinet was officially sworn in by King Willem-Alexander of the Netherlands with a total of 24 ministers and state secretaries – 9 from the VVD, 6 each from the CDA and D66, and 3 from the CU – on 26 October,[32][33] 225 days after the election, making it the longest cabinet formation in Dutch history.[34] The four-party coalition initially held 76 of 150 seats in the lower chamber and 38 of 75 seats in the upper chamber.[35]