for London, a position that he held in addition to his other responsibilities. In December 2013, the Fabian Society published a collection of essays edited by Khan that was titled Our London. Khan was also tasked with overseeing Labour's campaign for the 2014 London local elections, in which the party advanced its control in the city, gaining hold of twenty of the thirty-two boroughs. By this point, there was much talk of Khan making a bid for the London Mayoralty in 2016, when incumbent Mayor Boris Johnson would be stepping down. His options were affected by the outcome of the 2015 general election; if Labour won, then he would be expected to become a government minister, but if they lost then he would be free to pursue the Mayoralty. In December 2015, Khan voted against the Cameron government's plans to expand the bombing of targets in the Islamic State. Polls had suggested that Labour could be the largest party in a hung parliament following the 2015 general election, but ultimately the Conservatives secured victory. In the vote, Khan was returned for a third term as MP for Tooting, defeating his Conservative rival by 2,842 votes. He was one of 36 Labour MPs to nominate Jeremy Corbyn as a candidate in the Labour leadership election of 2015, but has said that he was "no patsy" to Corbyn and would stand up to him. He later stated that he nominated Corbyn to "broaden the debate" but did not then vote for him. On 9 May 2016, Khan resigned as an MP by his appointment to the ancient office of Crown Steward and Bailiff of The Three Chiltern Hundreds, a customary practice in the UK. This triggered a by-election in Tooting which was held on 16 June 2016. He is regularly named among the Top 100 London politicians in the London Evening Standards annual poll of the 1,000 most influential Londoners and is an Ambassador for Mosaic Network, an initiative set up by Prince Charles. Mayor of London In 2016, Sadiq Khan ran to become the mayor of London and was elected with 57% of the vote. He became just the third ever London Mayor and is London's first Muslim mayor and first ethnic minority mayor. Khan was officially sworn in as Mayor in a multi-faith ceremony held in Southwark Cathedral the following day. His first act as mayor was his appearance at