The Labour leader says staying a member could limit the government's powers to invest in industry.Read more
First Minister Carwyn Jones tells the Labour Party conference Theresa May lacks the "basic skills" to negotiate a Brexit deal.
Sunday Politics reporter Elizabeth Glinka has been taking a look at all the different stances.
The Labour leader told Andrew Marr he supported workers asking for a decent public sector pay rise.
Labour's NEC passed a proposal for tougher action against anti-Semitism, to be put to next week's conference.