German Foreign Minister summons U.S. ambassador over Merkel phone tapping Reuters 36 minutes ago File photo of U.S. President Barack Obama and German Chancellor Angela Merkel arriving for family picture event during the G20 summit in St.Petersburg . View gallery U.S. President Barack Obama (R) and German Chancellor Angela Merkel arrive for the family picture event … BERLIN (Reuters) - Germany's Foreign Minister has summoned the United States' ambassador to Germany, John B. Emerson, to discuss information obtained by Berlin that the U.S. may have monitored Angela Merkel's mobile phone, a government spokesman said on Thursday. The move comes a day after Merkel called President Barack Obama to demand immediate clarification and told him if such surveillance had taken place it amounted to a "grave breach of trust".