Donald Trump’s tariff plan could undermine the Brexit deal between the EU and the UK for trading arrangements in Northern Ireland.
Trump has imposed a two-tier tariff rate on the island of Ireland – with a 20% tax on exports from the republic but a 10% rate on the UK including Northern Ireland.
The EU tariffs will apply in Northern Ireland, creating a manufacturing price difference between Northern Ireland and Great Britain for any important components from the US.
The supply chains in Northern Ireland have become complex since Brexit, and detailed knowledge needed by officials to deal with a trade war has disappeared.