Q&A: What is the Northern Ireland Protocol and why is it controversial?

The Northern Ireland Protocol continues to prove controversial (Liam McBurney/PA)

UK Foreign Secretary Liz Truss has warned the EU that the UK Government will take action on the Northern Ireland Protocol if negotiators in Brussels do not show sufficient flexibility.

Days after historic Assembly elections in Northern Ireland, the post-Brexit arrangements for the region are once again threatening to cause a serious clash between the UK and the EU.