He was appointed chairman of the ONNED Executive Committee in 1984, and led the organisation to its 1st Conference in March 1987. He has been a member of the New Democracy Central Committee since the 2nd Party Conference in 1986. He was first elected as a New Democracy Member of the Hellenic Parliament representing Athens B in the general elections of 1989. He has since been reelected in 1990, 1993, 1996 and 2000. Meimarakis was one of New Democracy's parliamentary representatives from 1991 to 1992. He served as Deputy Minister for Sports from 1992 to 1993. In March 2001, at New Democracy's 5th Conference, he was elected as Secretary of the Central Committee, the first person to hold this role. He was reelected as Secretary in July 2004, and remained in this role until 15 February 2006, when he was appointed as the Minister for National Defense in the First Cabinet of Kostas Karamanlis. On 29 June 2012, he became Speaker of the Hellenic Parliament, a position he held until the next Parliament was elected in January 2015. In July 2015, Antonis Samaras resigned as leader of New Democracy following the 'No' vote in the bailout referendum. Meimarakis took over from Samaras as an interim leader. In this capacity he led the party into the snap election on 20 September 2015, at which New Democracy were defeated for a second time in nine months by SYRIZA. Meimarakis did however succeed in slightly increasing the ND vote share from 27.8% to 28.1%. Despite this, their seat tally dropped from 76 to 75. Meimarakis continued as interim leader following the September election, announcing that a New Democracy leadership election would take place before the end of the year and that he would be a candidate. On 24 November, Meimarakis appointed the secretary of the New Democracy parliamentary group, Ioannis Plakiotakis, as a Vice President of the party, before resigning and therefore making Plakiotakis the new interim leader. Meimarakis has been a Member of the European Parliament since the 2019 European elections. He has since been serving on the Committee on Foreign Affairs and its Subcommittee on Security and Defence. Within the centre-right European People's Party Group, he is one of the deputies of chairman Manfred Weber.
Personal life
Meimarakis is married to Ioanna Kolokota, the daughter of Greek actress Nitsa Marouda, and they have two daughters. He is fluent in English. Meimarakis is seen as down-to-earth, with Vassilis Monastiriotis of the London School of Economics commenting that he appeals to: "a broad cross-section: both working-class voters, who see him as a man of the people, and the traditional higher-income New Democracy supporters, who see him as a cunning operator able to hit Tsipras below the belt".