Question: who has the power to convict the president upon impeachment
[{'answer': 'Congress', 'provenance': [{'wikipedia_id': '1795376', 'title': 'Impeachment in the United States', 'start_paragraph_id': 13, 'start_character': 686, 'end_paragraph_id': 13, 'end_character': 694, 'bleu_score': 1.0, 'section': 'Section::::Federal impeachment.:Impeachable offenses: "High Crimes and Misdemeanors".\n'}]}]