Brexit has done more harm than good. We must return to a higher level of growth and prosperity for Britain, he said in his first speech as party leader at the social democratic Labour Party's annual conference in Liverpool.
Burnham will then present "various options" for the country's future relationship with the EU.
We will not be able to give Britain the clear path forward it needs for the rest of the century until we have decided on a long-term relationship with what remains our largest market.
The United Kingdom left the EU in 2020.
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