(LONDON) — A Northern Ireland party that props up Prime Minister Theresa May’s government says it won’t support her Brexit divorce deal, a blow to May’s hopes of winning approval for the agreement in Parliament.

The Democratic Unionist Party said Wednesday it won’t support the deal because of a provision designed keep an open border between EU member Ireland and the U.K.’s Northern Ireland after Brexit.

The pro-British Unionist party opposes the provision because it fears it would weaken the bonds between Northern Ireland and the rest of the U.K.

DUP leader Arlene Foster said, “We cannot sign up to something that would damage the Union.”

May wants to try again to get her twice-rejected Brexit deal through Parliament. Many pro-Brexit lawmakers have said they will back it, but only if the DUP agrees.

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