UK Prime Minister Theresa May's under growing pressure to secure changes to the controversial Irish border backstop from the EU.
A series of MPs in her Conservative Party say they can support her Brexit deal, if the backstop can be changed or scrapped.
It comes ahead of votes in the House of Commons on Tuesday on amendments which could be significant in determining the course of Brexit.
One of them is being proposed by Tory MP Sir Graham Brady, as political correspondent Theo Usherwood reports.
IN: "Sir Graham...
OUT: ...success."
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