Chancellor George Osborne will issue a warning on the need for the European Union to reform during a keynote address later today.
The Chancellor will stress the Conservatives' determination to renegotiate the terms of Britain's membership, declaring "We can't go on like this." Addressing a conference on EU reform, he will say:
"The biggest economic risk facing Europe doesn't come from those who want reform and renegotiation - it comes from a failure to reform and renegotiate.
"It is the status quo which condemns the people of Europe to an ongoing economic crisis and continuing decline. And so there is a simple choice for Europe: reform or decline.
"Our determination is clear: to deliver the reform, and then let the people decide."
More top news
John Cleese has paid tribute to his "wonderful" Fawlty Towers co-star, Andrew Sachs, following his death at the age of 86.
Top footballers star in an Football Association campaign aimed at helping to ensure every child feels safe playing football.
Police are investigating an allegedly threatening tweet, in which a user urged people should "Jo Cox" MP Anna Soubry.