The Democratic Unionist Party's leader Arlene Foster | Charles McQuillan/Getty Images DUP manifesto vows to oppose Brexit deal struck by Boris Johnson DUP deputy leader Nigel Dodds says his party wants a ‘sensible’ Brexit deal.

LONDON — Northern Ireland's Democratic Unionist Party launched its general election manifesto Thursday with a promise to oppose the Brexit deal Boris Johnson clinched with Brussels.

Speaking at an event in Belfast, DUP leader Arlene Foster said she was “committed to a deal that works for the whole of the United Kingdom and which does not leave Northern Ireland behind, with no border in the Irish Sea.”

The DUP — which propped up the Conservative government in Westminster after Theresa May lost her majority in 2017 — refused to support the Brexit deal struck by Johnson because it would entail checks on some goods traveling to the rest of the U.K.

The deal would keep Northern Ireland subject to EU customs union rules and some single market rules, despite it being included in trade deals the U.K. strikes with other countries.

Deputy DUP leader Nigel Dodds told the Belfast event that the party wants a “sensible” Brexit deal that would protect “both the economic and constitutional integrity of Northern Ireland within the United Kingdom.”

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“The DUP voted against Boris Johnson’s Brexit deal and we will use our votes and our influence to oppose its dangers to the economic and constitutional position of Northern Ireland,” he said.

Dodds added the party would not hand Labour Party leader Jeremy Corbyn the keys to Downing Street in the event of a hung parliament after the December 12 election. Foster said on Monday that the DUP could do a deal with Labour but only if Corbyn is booted out of his job.

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