Ed Miliband MP, Leader of the Labour Party, said:
"Tomorrow’s speech by David Cameron will define him as a weak Prime Minister, being driven by his party, not by the national economic interest.
"In October 2011, he opposed committing to an in/out referendum because of the uncertainty it would create for the country. The only thing that has changed since then is he has lost control of his party and is too weak to do what is right for the country.
"Everyone knows that the priority for Britain is the jobs and growth that we need. We have had warning after warning from British business about the dangers of creating years of uncertainty for Britain.
"This speech will do nothing for a young person looking for work, for a small business worried about a loan, for the family whose living standards are squeezed.
"Britain needs a Prime Minister who is making change happen now in Europe, ensuring that we put jobs and growth ahead of austerity and unemployment."