Britain's Secretary of State for Exiting the European Union, Stephen Barclay, arrives in Downing Street, in central London, Britain December 6, 2018. REUTERS/ Toby Melville

LONDON (Reuters) - Theresa May is “fighting day and night” to secure a Brexit agreement, aiming to make progress on the issue of the Northern Ireland backstop that is recognized as a concern on both sides, Brexit minister Stephen Barclay said on Thursday.

“Both sides see the backstop as temporary,” he said. “There is a recognition on both sides that the backstop is a concern.”

“There is movement but the question is how do we ensure that movement is sufficient for colleagues.”