After Labour's re-election at the
1987 election, an increasing rift opened up in the governing Labour Party between Prime Minister
David Lange and
Roger Douglas the
Minister of Finance. Troubled by Douglas' idea of a
flat tax and further
Rogernomics reforms after the
stock market crash in October 1987, Lange unilaterally put a halt to them in January 1988 while Douglas was out of the country in a press conference where he called for the nation to "have a cup of tea". In December 1988, Lange and Douglas' relationship bottomed out when Lange refused to renew the employment contract of Bevan Burgess, Douglas' press secretary, which was the major catalyst that led Douglas to decide leave Cabinet. Douglas then wrote to Lange to tell him that he intended to tell the Labour caucus he could no longer serve in a government led by him. Lange construed this letter as a resignation. Douglas was sacked as Minister of Finance and replaced with
David Caygill. Douglas and his allies brought a leadership challenge to Lange, whom they regarded as in a weak position, having alienated both the left and right wings of the Labour Party. Caucus brought forward the vote from early 1989 to 21 December in order to avoid the issue dominating headlines over the new year holiday period when there would be little else to report on. ==Public opinion polling==