"I am heartened by friends of the Union on both sides of the House (of Commons) and across the United Kingdom who have pledged to stand with the DUP in opposing a deal which weakens the Union and hands control to Brussels rather than Parliament," DUP leader Arlene Foster said in a statement.
"These are momentous days and the decisions being taken will have long-lasting ramifications. The Prime Minister must win the support of the Cabinet and the House of Commons. Every individual vote will count."
Earlier, Britain and the European Union reached a draft deal on the terms of the United Kingdom's exit from the bloc. The issue of the border between British-ruled Northern Ireland and EU member Ireland has been the biggest obstacle in the Brexit talks.
(Reporting by Graham Fahy Editing by Gareth Jones)
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