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I'm afraid Sadiq Khan is completely wrong. The European Court of Justice is the supreme legal authority in our country.

"EU debate: Boris Johnson says Brexit will be 'Britain's independence day' as Ruth Davidson attacks 'lies' of Leave campaign in front of 6,000-strong Wembley audience" by Michael Wilkinson, www.telegraph.co.uk. June 21, 2016.
I'm afraid Sadiq Khan is completely wrong. The European Court of Justice is the supreme legal authority in our country.