Jeremy Corbyn said his agenda for the European Union is the "very opposite" of David Cameron's as he insisted he would never share a platform with the Prime Minister to campaign for a vote to retain ties with Brussels.
The Labour leader and Prime Minister are both campaigning for a Remain vote in the June 23 referendum, but Mr Corbyn insisted "we are not on the same side of the argument".
Mr Corbyn said he wanted the EU to be focused on protecting the environment and ensuring sustainable industries in Europe.
The Labour leader also highlighted Justice Secretary Michael Gove's criticism of the deal negotiated by the Prime Minister in Brussels.
Asked on ITV's The Agenda if he would appear on the same stage as the Prime Minister, Mr Corbyn said: "No. We are not on the same side of the argument. He wants a free market Europe.
"He has negotiated what he believes is some kind of deal over welfare and the ever closer union, which is apparently legally questionable, according to Michael Gove.
"I want to see a Europe that is about protecting our environment and ensuring we have sustainable industries across Europe such as the steel industry and high levels of jobs and social protection across Europe.
"His agenda is the very opposite."