The UK government has been warned to stick to its commitment to avoid a hard border between Northern Ireland and the Republic.
Irish Foreign Minister Simon Coveney said a time-limited arrangement – or one that could be unilaterally ended by the UK – would never get EU backing.
The border issue is the main barrier to progress between the two sides.
With time running out, Theresa May, who briefs her cabinet on Tuesday, has to get both the EU and her MPs on side.
The UK is due to leave the EU in March, and although 95% of the deal is said to be complete, the tricky bit is proving to be how to honour the commitment by both sides to guarantee no new hard border in Ireland. Read more