Sir Keir Starmer has repeated that he is not planning to rejoin the EU's customs union, after the deputy prime minister said countries in such unions see a boost to their economies.
Speaking on a podcast on Thursday, David Lammy said it was "self-evident" that Brexit had damaged the British economy.
He added that rejoining the EU's customs union was "not currently our policy" - but highlighted that Turkey had seen growth as a result of its own union with the bloc.
The prime minister - who has said economic growth is his government's top priority - said he wanted to build closer trading ties with the EU but not break Labour's post-Brexit commitments.
