Mann sought and failed to be selected as Labour candidate in a by-election for the
Yorkshire South constituency for the
European Parliament in 1998, losing out to
Linda McAvan who went on to win the by-election. Mann was first elected as MP for Bassetlaw at the
2001 general election after the previous MP
Joe Ashton retired, and retained his seat at each subsequent election in which he stood. Mann was the first Labour MP to call for
Gordon Brown to resign following the
2010 general election. Mann was also vocal in criticising other MPs over the
expenses scandal, arguing that they could not be trusted to self-regulate. He criticised the shredding of documents related to expenses before 2010, saying "it looks like MPs trying to protect MPs again". He was also responsible for lodging the complaint that resulted in an inquiry into
Maria Miller's expense claims. Just over two months after Corbyn had won the leadership campaign, Mann continued to refuse to back him in an interview with the BBC, indicating he had no confidence in him. Instead, he said that he had confidence in the then shadow foreign secretary
Hilary Benn. He supported
Owen Smith in the failed attempt to replace Corbyn in the
2016 Labour leadership election. Mann faced criticism for allegedly perpetuating racial stereotypes against
Romani people and travellers in a booklet he produced on antisocial behaviour in 2007.
Drug policy One of Mann's earliest campaigns in his constituency was his inquiry into heroin use in the area. In September 2002, Mann called for more treatment for heroin users in North Nottinghamshire. The inquiry he instigated called for heroin addicts to be given the choice between treatment or prison. At the same time more local GPs were trained to help heroin addicts get their lives back under control. Following the reforms the number of addicts in treatment in Bassetlaw rose from 2 to 400, and acquisitive crime fell by 75%. Following a local newspaper story in October 2005, Mann raised an
Early day motion calling for the psychoactive plant species,
Salvia divinorum, to be banned in the UK (EDM796). It was later reported that Mann had written to the
Home Secretary in October 2008, urging her to take action with regard to salvia's legal status. The same report said that the
Advisory Council on the Misuse of Drugs had met to discuss salvia, among other substances, in April 2009, and that there would be a follow-up meeting in May.
The Observer newspaper gave the content of Mann's letter to
Jacqui Smith. "Sadly the issue has come to light again as our young people are using the internet and sites like
YouTube to broadcast their friends taking the drug and witnessing the hallucinogenic effects. Our young people are at risk and a wider cultural attachment to this drug seems to be developing that I am sure you agree – regardless of its legal status – needs nipping in the bud".
Local campaigns Mann was an active campaigner in his constituency of Bassetlaw, and an advocate of using campaigning strategies he refers to as "organising to win" elsewhere. He has organised numerous campaigns in his constituency, examples of which include, during 2003 and 2004, campaigning to save
Bassetlaw Hospital Accident and Emergency Department, helping former coal miners fight double charging solicitors to get their compensation back, and fighting Bassetlaw District Council's policy of "topple testing" headstones in local cemeteries. Mann kept a weekly column in the
Worksop Guardian and – along with other local figures – wrote occasional pieces for the
Retford Times.
Operation Midland In December 2014, Mann gave a dossier, compiled by him and containing child sexual abuse allegations against 22 high-profile individuals, to the Metropolitan Police, which as part of
Operation Midland was pursuing investigations into homicide and child abuse allegedly committed some decades previously at the
Dolphin Square apartment building in
Pimlico, London. Mann said that he had made a detailed examination of hundreds of pieces of evidence from members of the public and that he believed some of the twelve former UK government ministers named were "definitely child abusers". He said that evidence against half of those on the list was "very compelling" and that some could "definitely be prosecuted". Operation Midland was closed in 2016 when the allegations were found to be false.
Stance on antisemitism Mann has described
antisemitism as "the worst of
racisms", and chaired the
All-Party Parliamentary Group Against Antisemitism during 2004–2019. In May 2009, Mann received the
American Jewish Committee's
Jan Karski Award in recognition of his commitment to fighting antisemitism in all of its forms. On 28 April 2016, Mann confronted
Ken Livingstone in a public stairwell in front of a news camera crew, calling him a "
Nazi apologist" and a "fucking disgrace" over Livingstone's remarks in a radio interview that
Adolf Hitler, on coming to power, supported Jewish emigration to
Palestine. Labour's chief whip,
Rosie Winterton, told Mann it was "completely inappropriate for Labour members of Parliament to be involved in very public rows on the television". Mann wrote in
The Jewish Chronicle in early May 2016: "If Labour cannot combat racism then we are nothing – and racism always includes antisemitism. If we cannot do that now, then we have no reason to exist". In June 2017, he criticised Corbyn as "a man who claims he's dedicated his entire life to racism"(sic) but was "not prepared to make a speech exclusively, explicitly, just on antisemitism". In July 2019, Prime Minister Theresa May appointed Mann as a government advisor on antisemitism. In September 2019, Mann announced that he was taking up a full-time role as the government's antisemitism advisor. His own constituency voted to leave by a margin of 68% to 32%. Mann was one of only three Labour MPs, along with
Ian Austin and
Kevin Barron, to defy a three-line whip and to vote for Theresa May's Brexit deal in the 15 January 2019
Meaningful vote. On 29 January 2019, Mann was one of seven Labour MPs to vote with the Conservative Government supporting
Graham Brady's amendment mandating Theresa May to renegotiate the Irish backstop in the Withdrawal Agreement. The other six MPs were Austin, Barron,
Jim Fitzpatrick,
Roger Godsiff,
Kate Hoey and
Graham Stringer. On 3 April 2019, Mann was one of twelve Labour and ex-Labour MPs to vote alongside the Conservatives against the Cooper Bill, which had been supported by the Labour Party. Nonetheless, the bill passed the House of Commons with a difference of one vote. On 3 September 2019, Mann and Hoey were the only Labour MPs to vote with the Government in an attempt to prevent MPs from taking control of the house to block a potential no-deal Brexit, saying "I didn't vote with the government. I voted against an amendment that is deliberately calculated to block Brexit". ==House of Lords==