Constituency Labour Party decided to open its parliamentary selection to all interested candidates, including the incumbent MP since 1974, Tom Cox. This prompted Cox, then in his mid-70s, to announce his retirement rather than risk de-selection. In the subsequent selection contest, Khan defeated five other local candidates to become Labour's candidate for the seat. He was elected to Parliament at the 2005 general election. Khan was one of the Labour MPs who led the successful opposition to Prime Minister Tony Blair's proposed introduction of 90 days' detention without charge for those suspected of terrorism offences. In recognition of this, The Spectator—a right-wing magazine then edited by Boris Johnson—awarded him the "Newcomer of the Year Award" at the 2005 Parliamentarian of the Year Awards. The magazine's editorial board stated that he had received the award "for the tough-mindedness and clarity with which he has spoken about the very difficult issues of Islamic terror". In August 2006, two days after seven terrorists were arrested for attempting the 2006 transatlantic aircraft plot Khan signed an open letter to Tony Blair that was signed by prominent Muslims and published in The Guardian. The letter criticised UK foreign policy and in particular the 2003 invasion of Iraq, stating that Blair's policies had caused great harm to civilians in the Middle East and provided "ammunition to extremists who threaten us all". In interviews with the BBC, Labour Home Secretary John Reid - who had coordinated the arrests - described the letter as "a dreadful misjudgement", and former Conservative leader Michael Howard described it as "a form of blackmail". Khan had to repay £500 in expenses in 2007 in relation to a newsletter sent to constituents featuring a "Labour rose", which was deemed to be unduly prominent. While the content of the newsletter was not deemed to be party political, the rose logo was found to be unduly prominent which may have had the effect of promoting a political party. There was no suggestion that Khan had deliberately or dishonestly compiled his expenses claims, which were not explicitly disallowed under the rules at that time. The rules were retrospectively changed disallowing the claim, which had previously been approved by the House of Commons authorities. On 3 February 2008, The Sunday Times claimed that a conversation between Khan and prisoner Babar Ahmad – a constituent accused of involvement in terrorism – at Woodhill Prison in Milton Keynes had