The Turkish government has summoned Germany's ambassador to protest the cancellation of rallies in the country in support of President Recep Tayyip Erdogan. The move comes in the wake of latest spat between the two countries. <br/><br/>Turkey's Justice Minister Bekir Bozdag earlier scrapped a visit to Germany after the authorities blocked a rally promoting a referendum that could expand Erdogan's powers.<br/><br/>A senior Turkish official said the new row adds to tensions between Turkey and Germany over a number of disputes including Ankara's provisional detention of a German journalist on terrorism-related charges.