Question: What British Politician, who was the Prime Minister of the Unted Kingdom, was the person who forced a resignation from PAtrick Mercer?

full_context: Document 1: David Cameron: David William Donald Cameron ( ; born 9 October 1966) is a British politician who was Prime Minister of the United Kingdom from 2010 to 2016 and Leader of the Conservative Party from 2005 to 2016. He was Member of Parliament (MP) for Witney from 2001 to 2016. Cameron identifies as a One-Nation Conservative, and has been associated with both economically liberal and socially liberal policies.
Document 2: Jonathan Aitken: Jonathan William Patrick Aitken (born 30 August 1942) is a former Conservative Member of Parliament in the United Kingdom (1974–97), and a former Cabinet minister. He was convicted of perjury in 1999 and received an 18-month prison sentence, of which he served seven months. He is currently president of Christian Solidarity Worldwide. Aitken was also a member of the Privy Council of the United Kingdom.
Document 3: Patrick Mercer: Colonel Patrick John Mercer, OBE (born 26 June 1956) is an author and former British politician. He was Conservative shadow homeland security spokesman before being forced to resign by David Cameron in 2007 for making "unacceptable" racist remarks in an interview with "The Times". He was elected as a Conservative in the 2001 general election, until resigning the party's parliamentary whip in May 2013 following questions surrounding paid advocacy, and was an Independent MP representing the constituency of Newark in Parliament until his resignation at the end of April 2014 after the Standards Committee suspended him for six months for "sustained and pervasive breach of the house's rules".
Document 4: Patrick McLoughlin: Sir Patrick Allen McLoughlin (born 30 November 1957) is a British Conservative Party politician. He first became a Member of Parliament (MP) at the 1986 by-election in West Derbyshire. The constituency became the Derbyshire Dales for the 2010 general election; McLoughlin has remained the seat's MP. On 4 September 2012, he was appointed Secretary of State for Transport. As a former miner, he is one of the few Conservative MPs to have been a manual worker before being elected to Parliament. On 14 July 2016, he became Chairman of the Conservative Party and Chancellor of the Duchy of Lancaster, under the new administration of Conservative Prime Minister Theresa May.
Document 5: David Davis (British politician): David Michael Davis (born 23 December 1948) is a British Conservative Party politician who has been the Secretary of State for Exiting the European Union since 2016 and the Member of Parliament (MP) for Haltemprice and Howden since 1997, having previously been the MP for Boothferry from 1987. Davis was sworn of the Privy Council in the 1997 New Year Honours, having previously been Minister of State for Europe from 1994 to 1997.
Document 6: George Osborne: George Gideon Oliver Osborne, (born Gideon Oliver Osborne; 23 May 1971) is a British Conservative Party politician, who was Member of Parliament (MP) for Tatton from June 2001 until he stood down on 3 May 2017. He served as Chancellor of the Exchequer under Prime Minister David Cameron from 2010 to 2016. He has been editor of the "London Evening Standard" since May 2017.
Document 7: Tim Owen: Timothy Francis "Tim" Owen {'1': ", '2': ", '3': ", '4': "} (born 29 October 1955) is a former Australian politician and a former deputy commander of the Australian Forces in Iraq and Afghanistan. He was a member of the New South Wales Legislative Assembly representing the electoral district of Newcastle for the Liberal Party of Australia from the 2011 New South Wales state election until 6 August 2014 when he moved to the parliamentary crossbench and sat as an independent after the Independent Commission Against Corruption heard evidence that Owen may have breached electoral funding laws. In May 2014, Owen had announced that he would not contest his seat at the next state election. On 12 August 2014 Owen resigned from parliament triggering the 2014 Newcastle by-election.
Document 8: Mark Collett: Mark Adrian Collett (born 3 October 1980) is a British political activist. He is a former chairman of the Young BNP, the youth division of the British National Party (BNP), and was director of publicity for the party before his BNP membership was suspended in early April 2010.
Document 9: Liberal Democrats leadership election, 2006: In the 2006 Liberal Democrats leadership election, Sir Menzies Campbell was elected to succeed Charles Kennedy as Leader of the Liberal Democrats, the third-largest political party in the United Kingdom.
Document 10: Patrick John: Colonel Patrick Roland John (born Roseau, 7 January 1938) was the Prime Minister of Dominica as well as the Premier of Dominica. During his premiership Dominica gained independence from the United Kingdom and he became the first Prime Minister of Dominica. He was leader of the Waterfront and Allied Workers' Union and mayor of Roseau before being elected to the legislature in 1970. He took on prime ministerial duties in 1974 following the resignation of Edward Oliver LeBlanc. After mass protest forced him to resign, John unsuccessfully attempted to overthrow the government of Prime Minister Eugenia Charles with the backing of white supremacist groups (in what became dubbed "Operation Red Dog"). As a result, he was jailed for twelve years, of which he served only five years.
Document 11: Boris Johnson: Alexander Boris de Pfeffel Johnson (born 19 June 1964), known as Boris Johnson, is a British politician, popular historian and journalist. He has served as Secretary of State for Foreign and Commonwealth Affairs since 2016 and as Member of Parliament (MP) for Uxbridge and South Ruislip since 2015. He had previously been MP for Henley from 2001 to 2008 and Mayor of London from 2008 to 2016. A member of the Conservative Party, Johnson identifies as a one-nation conservative and has been associated with both economically and socially liberal policies.
Document 12: Nigel Hastilow: Nigel Hastilow (born 1956) is a journalist, author, businessman and politician. He is a former editor of the "Birmingham Post" and was Conservative Party candidate for Birmingham Edgbaston in the 2001 general election. In April 2007, Hastilow was selected a prospective parliamentary candidate (PPC) for the Conservative Party for the Halesowen and Rowley Regis constituency but was dumped after he received criticism about a newspaper column he wrote for the "Express & Star" which included the statement "Enoch Powell was right", sparking a national controversy about immigration and racism.
Document 13: Conservative Party (UK): The Conservative Party, officially the Conservative and Unionist Party, is a centre-right political party in the United Kingdom. It is currently the governing party, having been so since the 2010 general election, where a coalition government with the Liberal Democrats was formed. In 2015, the Conservatives led by David Cameron won a surprise majority and formed the first Conservative majority government since 1992. However, the 2017 snap election on Thursday 8 June resulted in a hung parliament, and the Conservatives lost their parliamentary majority. They are reliant on the support of a Northern Irish political party, the Democratic Unionist Party (DUP), in order to command a majority in the House of Commons through a confidence-and-supply deal. The party leader, Theresa May, has served as both Leader of the Conservative Party and Prime Minister since 13 July 2016. It is the largest party in local government with 9,237 councillors. The Conservative Party is one of the two major contemporary political parties in the United Kingdom, the other being its modern rival, the Labour Party. The Conservative Party's platform involves support for free market capitalism, free enterprise, fiscal conservatism, a strong national defence, deregulation, and restrictions on trade unions.
Document 14: Iain Duncan Smith: George Iain Duncan Smith (born 9 April 1954), often referred to by his initials IDS, is a British Conservative Party politician. The Secretary of State for Work and Pensions from 2010 to 2016, he was previously the Leader of the Conservative Party and Leader of the Opposition from 2001 to 2003. He was first elected to Parliament at the 1992 general election as the MP for Chingford—which he represented until the constituency's abolition in 1997—and he has represented its successor constituency of Chingford and Woodford Green ever since.
Document 15: Sir William Mount, 1st Baronet: Sir William Arthur Mount, 1st Baronet CBE (Hartley, Hampshire, 3 August 1866 – 8 December 1930) was a British Conservative Party politician and Member of Parliament for the Newbury constituency. He is the great-grandfather of Conservative politician David Cameron, who was Prime Minister of the United Kingdom from 2010 to 2016.
ground_truth: David Cameron