"We see what happens when ideological extremism goes unchecked," the Liberal Democrat leader told the Financial Times. "It would be very complacent to assume that can't happen here".
Clegg compared Tory eurosceptics to the Republican Tea Party wing, arguing that they both shared "a rigid, ideological self-belief that runs roughshod over the interests of the country”. Bill Cash, Peter Bone and Douglas Carswell are among the most prominent Tory eurosceptics.
The Deputy Prime Minister also warned that Tory eurosceptics' aim to take Britain out of the European Union would be an act of "economic suicide".