Mullen is first elected to Seanad Éireann (the Irish Senate) in 2007 for the National University of Ireland constituency, and has been continuously re-elected in 2011, 2016, 2020, and 2025, often topping the poll among NUI graduates. In 2018, he founds the Human Dignity Alliance, an anti-abortion political party. He is also affiliated with the European Christian Political Party (ECPP).
Mullen has built his career around social conservative causes:
Anti-abortion advocacy: He opposes the repeal of the Eighth Amendment and seeks stronger protections for conscientious objection among medical staff.
Opposition to same-sex marriage: He is prominent during the 2015 referendum opposing constitutional changes related to marriage.
Human rights and palliative care: He introduces bills and motions promoting hospice care and the protection of vulnerable adults.
Freedom of conscience and family values: He advocates policies emphasizing parental rights in education, ethical protections, and support for families.
International advocacy: He criticizes human rights abuses in China, the treatment of religious minorities, and European Union (EU) bureaucratic overreach, while seeking Ireland’s engagement on human dignity standards internationally.
A lifelong practicing Roman Catholic, Mullen emphasizes the principle of human dignity in both politics and daily life, integrating faith and reason in his ethical framework. He maintains a connection to Irish culture and the Irish language, and has engaged in public discussions on moral and social issues, grounding his positions in Catholic teaching without seeking to impose religious law.
In summary, Mullen is a long-standing independent Irish senator influential in debates on social policy, ethics, and human rights. His career is marked by consistent advocacy for pro-life positions, family integrity, and freedom of conscience, alongside active engagement in European and international policy discussions on human dignity and social justice.
A notable aspect of McGahon’s political career is his stand against the Provisional IRA when that organisation’s campaign of violence is at its height. At great personal risk, he refuses to close his newsagents shop in Dundalk during the funerals of the hunger strikers in 1981. He takes another huge risk a few years later when he gives evidence in the High Court in support of The Sunday Times, which is being sued for libel by Thomas Murphy for accusing him of directing an IRA bombing campaign in Britain. Local Gardaí are ordered not to get involved in the case, but McGahon is not deterred from giving evidence that helps the newspaper to defend the claims being made against it by Murphy.
A maverick and outspoken TD, McGahon is known to speak his mind on many issues including divorce, crime, and single mothers. He once advocates that pedophiles should be castrated as part of their prison sentence and is the only TD to oppose the referendum to abolish the death penalty from the Constitution. He also argues that those under 21 years of age should not be able to drive or drink. He is a member of the World Anti-Communist League and opposes the decriminalisation of homosexuality. In 1993, he is the only TD to oppose the decriminalisation of homosexuality and says in the Dáil that:
“I regard homosexuals as being in a sad category, but I believe homosexuality to be an abnormality, some type of psycho-sexual problem that has defied explanation over the years. I do not believe that the Irish people desire this normalisation of what is clearly an abnormality. Homosexuality is a departure from normality and while homosexuals deserve our compassion, they do not deserve our tolerance. That is how the man in the street thinks. I know of no homosexual who has been discriminated against. Such people have a persecution complex because they know they are different from the masses or normal society. They endure inner torment, and it is not a question of the way others view them. The lord provided us with sexual organs for a specific purpose. Homosexuals are like left-hand drivers driving on the right-hand side of the road.”
On the other hand, McGahon speaks out strongly against the influence of the drink industry and defies his own party whip to vote with his left-wing friend Tony Gregory in favour of banning of hare coursing. He is also on good personal terms with members of the Oireachtas such as Michael D. Higgins and David Norris despite holding fundamentally opposed views to them.
McGahon does not contest the 2002 Irish general election and retires from politics.
McGahon lives in Ravensdale, County Louth. His son Conor is a Louth County Councillor from 1991 to 1999 and his brother Johnny is a Louth County Councillor from 1995 to 2004. Johnny’s nephew, John McGahon, is elected to Louth County Council at the 2014 Irish local elections and to Seanad Éireann in 2020.
McGahon dies at the age of 80 on February 8, 2017, following a short illness. Following a Mass at St. Patrick’s Cathedral on February 11, he is buried afterwards in St. Patrick’s Cemetery.
