He is Co-Chair of the Media Working Group of the European Parliament and the EPP's Head of National Delegation for Malta.

In 2019, Casa successfully negotiated the Work-Life Balance Directive, which enshrined paternal leave as an EU right for the first time.

The report, led jointly with Dutch MEP Esther de Lange received decisive backing by the European Parliament in committee and plenary stages.

This law also provides for 5 days of annual carers' leave and the right to request flexible working arrangements.

[11] On 26 February 2019 the Committee on Employment and Social Affairs approved the agreement David Casa reached with the Council on the Work Life Balance Directive.

In 2021, David Casa presided over the first edition of the Daphne Caruana Galizia Prize for Journalism, for which he was responsible as Quaestor of the European Parliament and as Co-Chair of the Media Working Group.

[13] David Casa was one of the founding members and subsequently Secretary General of the Moviment Iva ("Yes to Europe Movement"), an organisation which played a fundamental role in the campaign in favour of Malta's accession to the European Union in the run-up to the referendum on the subject.