Ministers have defended plans to tighten the rules on strike ballots after unions said they would make legal strikes "almost impossible". Under current rules all that is needed for a strike is a simple majority of those that take part in a ballot. But the Trade Union Bill would impose a minimum 50% turnout....Business Secretary Sajid Javid said: "Trade unions have a constructive role to play in representing their members' interests but our one nation government will balance their rights with those of working people and business."These changes are being introduced so that strikes only happen when a clear majority of those entitled to vote have done so and all other possibilities have been explored."But TUC general secretary Frances O'Grady said the Bill would "make it almost impossible for workers to exercise what is their democratic right and civil liberty".Ms O'Grady said the changes would enable employers to "stick two fingers up" to workers by bringing in agency staff to break any strikes - and people standing on picket lines would be "subject to arrest".