[6] In July 2013, during the Protection of Life During Pregnancy Bill 2013 Seanad debate, Ó Domhnaill claimed that allowing abortions in the case of foetal anomalies would deprive Ireland of future Special Olympics athletes.

[8] In December 2016, Ó Domhnaill resigned from the Fianna Fáil party after he was found to have breached ethics legislation.

[9] However, with the support of the Irish Greyhound Owners and Breeders' Federation, Ó Domhnaill was a candidate, again for the Agricultural Panel, in the March 2020 Seanad election.

[12] On 20 November 2012, the Standards in Public Office Commission (SIPO) announced a formal investigation into allegations relating to Ó Domhnaill's travel and subsistence expenses claims.

In May of that year, he was reported to have breached ethics rules on at least three occasions, with travel and subsistence claims for being at events held at the same time but hundreds of kilometres from each other.

Ó Domhnaill's habit of submitting his expenses claims many months (and, at times, longer) after incurring them was also noted.