Supreme Court tells PM she must ask for permission to leave EU

An important decision was announced on Tuesday morning about the way that the UK can officially start the process to leave the European Union (EU).

The Supreme Court, which is the highest court in the country, has announced that UK Prime Minister Theresa May will have to ask for Parliament's permission before she can officially start the process for the UK to leave the EU.

Find out more with Newsround's guide to the case.

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