Brexit Lewin has previously campaigned in favour of remaining in the
European Union (EU). He said that the prospect of a
no-deal Brexit was "motivation enough" to form the alliance, and called on the parties to recognise that they had "more in common" instead of exaggerating their differences "for party gain". He called on Labour to make an "early manifesto pledge" to not rejoin the EU in its first term in power, saying that any proposal would "consume" a first-term Labour government and potentially "play into the hands of the Conservatives", and also stated that he thought it was "inconceivable" that all EU member states would welcome the UK back into the EU.
Russia and Ukraine Lewin supported
Ukraine following
Russia's invasion in 2022, attending a
vigil in support of Ukraine in February 2023. In February 2025, he criticised
U.S. president Donald Trump for opening
peace negotiations with
Russia without the involvement of Ukraine, calling it "a dangerous moment" and stating that peace "should only come on terms agreed by
President Zelenskyy".
Israel and Palestine In February 2024, Lewin expressed support for a
two-state solution and a humanitarian
ceasefire in the
Gaza war. Following the
ceasefire agreement in January 2025, he expressed his support for
foreign secretary David Lammy's statement, adding that there was "real hope that the cycle of violence and destruction will end". In July 2025, following prime minister
Keir Starmer's commitment to recognising
Palestinian statehood at the September 2025 meeting of the
United Nations General Assembly unless Israel agrees to a ceasefire, Lewin stated "what is happening in Gaza is a humanitarian catastrophe and the actions of
Netanyahu’s
government are indefensible". ==Personal life==