British Prime Minister Theresa May yesterday said she would be "armed with a fresh mandate and new ideas" when she meets European Union negotiators over her Brexit deal.
EU officials have insisted that the deal is not open for renegotiation.
But May wrote in the Sunday Telegraph that she would be "battling for Britain and Northern Ireland" in her efforts to get rid of the agreement's unpopular backstop provision.
The backstop is intended to ensure there is no return to a hard border with Ireland, but Brexit supporters fear it will keep Britain tied to the EU's customs rules.
MPs voted last week to send May back to Brussels to renegotiate the clause, suggesting her deal would then be able to pass after it was roundly rejected in parliament last month.
"When I return to Brussels I will be battling for Britain and Northern Ireland, I will be armed with a fresh mandate, new ideas and a renewed determination to agree a pragmatic solution," May added.
May has promised MPs that she will bring any revised deal back to be voted on by MPs on February 13.
Meanwhile, British officials have revived Cold War emergency plans to relocate the royal family should there be riots in London if Britain suffers a disruptive departure from the European Union next month, two Sunday newspapers reported.
The Mail on Sunday also said it had learnt of plans to move the royal family, including Queen Elizabeth, to safe locations away from London.