"The Prime Minister will visit Northern Ireland tomorrow, where she will deliver a speech in which she will confirm the government's intention to avoid establishing a full-fledged border in the region," the spokesperson said.
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Answering questions, the representative of the prime minister denied media reports that May is considering the possibility of holding early parliamentary elections.
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May is due to report back to parliament on her negotiations with the EU on 13 February.
The backstop solution, which aims to avoid a hard border between Northern Ireland and the Republic of Ireland, has been a source of concern for many UK lawmakers, as it may lead to customs checks within the United Kingdom.