Premier Matteo Renzi had a heated exchange with German Chancellor Angela Merkel during the European summit in Brussels in which he said “ you cannot tell us that you are donating blood to Europe, dear Angela,” sources said on Friday. The exchange at the start of the second day of the summit when Renzi confronted Merkel about Germany's opposition to rapid completion of the process towards a banking union in the eurozone, the sources said. Merkel is said to have admitted that there have too many delays over this issue due to a series of emergencies that the union has had to face Renzi's stance was backed by several other leaders, including French President Francois Hollande, Portuguese Prime Minister António Costa and Greek Prime Minister Alexis Tsipras. Earlier on Friday Merkel's spokesperson denied speculation that there is a rift between Italy and Berlin over migrants after Renzi said he was against the EU being led solely by Germany. “ I