The Prime Minister has rejected a suggestion the failure to get a deal with the EU would see the UK stuck with the Northern Irish backstop plan permanently.
She was responding to Andrew Murrison, the Tory MP and chair of the Northern Ireland Affairs Committee, who compared it to a "post-war pre-fab".
"It's sold as temporary, it's built to last, and it's likely to outlive us all," he explained.
However, the PM dismissed his comments, telling the Commons Liaison Committee it would only ever be a temporary solution.
She added: "Neither side thinks the backstop is a good place to be."
The PM admitted it will not be possible for the UK to unilaterally withdraw from it, though, but said this was a guarantee to the people of Northern Ireland there would never be a hard border in place.