Question: What politician worked with Vidar Helgesen and was the Leader of the Conservative Party?

Context paragraphs:
Erna Solberg: Erna Solberg (] ; born 24 February 1961) is a Norwegian politician who has been Prime Minister of Norway since October 2013 and Leader of the Conservative Party since May 2004.

Colin Craig: Colin Craig (born 8 January 1968) is a New Zealand businessman who was the founding leader of the Conservative Party of New Zealand.  Craig is a millionaire who owns companies that manage high-rise buildings.  His current company manages about $1.3 billion of assets.  He is against same-sex marriage, foreign ownership of land and housing and "anti-smacking" legislation.  In June 2015, Craig resigned as leader of the Conservative Party following allegations of inappropriate behaviour surrounding the party's former press secretary Rachel MacGregor and tensions with the party's governing board.  Craig has since admitted to inappropriate conduct with MacGregor but has denied charges of sexual harassment.  On 27 June, Colin Craig was formally suspended from the Conservative Party.  Since then, his suspension has been invalidated which would enable Craig to contest the Conservative Party's leadership.  On 16 November 2015, Craig announced that he would not be contesting the Conservative Party leadership in lieu of a police investigation against him over his Party's spending during the 2014 general election.

The New Canada: The New Canada is a Canadian political literature book written by Reform Party of Canada founder and leader Preston Manning and published by Macmillan Canada.  The book explains the personal, religious, and political life of Preston Manning and explains the roots and beliefs of the Reform Party.  At the time of its publishing in 1992, Reform had become a popular populist conservative party in Western Canada after the mainstream Progressive Conservative Party of Canada was collapsing in support and in 1991 decided to expand eastward into Ontario and the Maritimes.  One year later the PC party collapsed in the 1993 federal election, allowing the Reform Party to make political history in Canada, deplacing the PCs as the dominant conservative party in Canada.  Reform, later renamed the Canadian Alliance, merged with the PC Party in 2003, to form a united right-wing alternative to the governing Liberal Party of Canada, named the Conservative Party of Canada which has dropped many of the populist themes that the Reform Party had.

Dick Harris: Richard M. Harris (born September 6, 1944) is a Canadian politician.  He was a Member of Parliament from 1993 to 2015 and sat as a member of the Conservative Party of Canada.  He was previously member of the Reform Party of Canada and the Canadian Alliance.  From 2004 to 2015, he represented the electoral district of Cariboo—Prince George, and formerly represented Prince George–Bulkley Valley.  He was first elected during the 1993 federal election and was re-elected in 1997, 2000, 2004, 2006, 2008 and 2011.  He challenged Reform Party leader Preston Manning for leadership when Manning proposed merging the party with the Progressive Conservative Party of Canada.  He later campaigned for Stockwell Day to become leader.  The most prominent position he held with his party was Chief Opposition Whip from 2001 to 2002.  He generated controversy when he appointed an unelected, Conservative Party member to represent a neighbouring electoral district in governmental affairs, though the electoral district had an elected Member of Parliament, but from an opposition party.  In Fiscal Year 2009-10 he was the top spending Member of Parliament, and had the largest hospitality and lowest advertising expenditures of any house member.

Vidar Helgesen: Vidar Helgesen (born 21 November 1968) is a Norwegian diplomat and politician for the Conservative party.  He was appointed Minister of Climate and the Environment on 16 December 2015, having served as Chief of Staff to Prime Minister Erna Solberg from 2013 to 2015.

Andrew Scheer: Andrew James Scheer, PC MP (born May 20, 1979) is a Canadian politician who is the current leader of the Conservative Party of Canada and Leader of the Opposition.  He has been the Member of Parliament for the riding of Regina—Qu'Appelle since 2004 and served as Speaker of the House of Commons from 2011 to 2015.  At age 32, he was the youngest Speaker in Canadian parliamentary history.  On September 28, 2016, Scheer announced his bid for the leadership of the Conservative Party.  On May 27, 2017, he became the leader of the Conservative Party of Canada on the 13th and final ballot of the leadership election, with 50.95% of the vote.

Marjory LeBreton: Marjory LeBreton, PC (born July 4, 1940) is a former Leader of the Government in the Canadian Senate, a cabinet-rank position; and past national chair of Mothers Against Drunk Driving in Canada.  She worked with four leaders of the Progressive Conservative Party of Canada - John Diefenbaker, Robert Stanfield, Joe Clark and Brian Mulroney - from 1962 to 1993 before being appointed to the Senate on the advice of Mulroney.  She sat as a Progressive Conservative Senator from her appointment until moving with most of her caucus colleagues to the new Conservative Party of Canada in 2004, of which she was soon elected to Chief Whip.  She served as an advisor to then opposition leader Stephen Harper during the 2006 election, which the Conservative Party won.  After the election, she was named to the cabinet position Leader of the Government in the Senate.  On July 4, 2013, LeBreton announced she would not continue in the position as of the next cabinet shuffle, which occurred later that summer.  She retired from the Senate upon reaching her 75th birthday on July 4, 2015.

Robert Stanfield: Robert Lorne Stanfield, PC, QC (April 11, 1914 – December 16, 2003) was the 17th Premier of Nova Scotia and leader of the federal Progressive Conservative Party of Canada.  He was born into an affluent Nova Scotia clothing manufacturing and political family in 1914.  He graduated from Dalhousie University and Harvard Law School in the 1930s.  Stanfield became the leader of the Nova Scotia Progressive Conservative Party in 1948, and after a rebuilding period, led the party to government in 1956.  As premier, he won three straight elections.  His government was credited with modernizing the way the province delivered education and medical services.  In 1967, he resigned as premier and became the leader of the federal Progressive Conservative Party.  He was the leader of the "Her Majesty's Loyal Opposition" and fought three general elections, losing each time to the Liberals under Pierre Trudeau.  He resigned as leader in 1976 and from public office in 1979.  In retirement, he lived mostly in Ottawa, and died there in 2003 from complications due to pneumonia.  He is sometimes referred to as "the best prime minister Canada never had".  As one of Canada's most distinguished and respected statesmen, he was one of several people granted the style "The Right Honourable" who were not so entitled by virtue of an office held.

Minister of Climate and the Environment: The Minister of Climate and the Environment (Norwegian: "Klima- og miljøministeren" ) is a Councilor of State and Chief of Norway's Ministry of the Environment.  Since 16 December 2015 the position has been held by Vidar Helgesen of the Conservative Party.  The ministry is responsible for environmental issues, including influencing environmental impacts on other ministries.  Subordinate agencies include the Directorate for Cultural Heritage, the Polar Institute, the Environment Agency and the Mapping Authority.

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.

Supporting paragraphs: Vidar Helgesen Erna Solberg
Answer: Erna Solberg