The Labour Party's shadow Chancellor of the Exchequer John McDonnell speaks as party leader Jeremy Corbyn looks on at the party's conference in Liverpool, Britain, September 24, 2018. REUTERS/Phil Noble

LIVERPOOL, England (Reuters) - John McDonnell, finance spokesman for Britain’s opposition Labour Party, said on Monday he could not see Prime Minister Theresa May bringing back a Brexit deal from Brussels that parliament could pass.

At his party’s annual conference in the northern city of Liverpool, McDonnell also said a Labour government would change the atmosphere of the Brexit negotiations, after the mood soured towards May’s plans at an EU summit last week.