ATHENS (Reuters) - Greek opposition leader Antonis Samaras attacked Prime Minister Alexis Tsipras for calling a referendum on a bailout deal, saying it was effectively setting the country on a collision course with Europe. "European identity is an accomplishment of Greece, and New Democracy is clearly sided with democracy and Europe," Samaras, a former Greek prime minister and leader of the New Democracy conservatives, said in a statement. Earlier Alexis Tsipras said he would convene parliament to ratify his proposal of a referendum on bailout demands of the country's EU and IMF lenders. ...