In 2006, McKee joined Ógra Fianna Fáil, the youth wing of Fianna Fáil, and established the Thomas Francis Meagher Cumann during his time in WIT. During his time in Waterford he worked closely with former Minister for Transport Martin CullenTD.[citation needed] McKee held positions both locally and nationally in Ógra Fianna Fáil. He was elected Leinster representative on Ógra Fianna Fáil's National Youth Committee in 2011.[citation needed] During 2010 McKee worked as an intern in Seanad Éireann for Senator Mark Daly.[citation needed]
In 2013 he declared his candidacy for Kilkenny County Council in the forthcoming elections and in May 2014 was elected in the local electoral area of Kilkenny City for Fianna Fáil.[11] He was elected chairman of the Joint Policing Committee and leas-cathaoirleach of the council. In March 2015 McKee left Fianna Fáil amid rumors of homophobic bullying and joined the newly formed Renua party.[12][6][13] His departure prompted criticism from a number of high-profile Fianna Fáil colleagues, including Michael McGrath and Timmy Dooley. He later stated that before joining Renua, he had considered joining Sinn Féin.[14]
In December 2016, McKee left Renua Ireland and became an independent.[16] He returned to Fianna Fáil in 2017, which was met with criticism from some members of the party and prompted comment from Micheál Martin and a number of board members of the party to resign.[17]
In February 2018, he garnered criticism over comments he made about Ruth Coppinger on Twitter for which later apologised.[18] In November 2018, McKee announced that he would not be standing for re-election.[19]