Paul Murphy (Dublin South West, Socialist Party) | Oireachtas source

Surely the most obvious vulnerability is US politics, especially in light of the Pfizer–Allergan merger. The merger, which will minimise the amount of tax paid by locating in Ireland, has brought the question to the centre of US politics. It is featuring to some extent in the US presidential election campaign. The most obvious vulnerability is the United States changing its tax code very quickly to limit the attractiveness to multinationals of directing profits through Ireland.