Question: who tries the president if he is impeached
[{'answer': 'the United States Senate', 'provenance': [{'wikipedia_id': '1795376', 'title': 'Impeachment in the United States', 'start_paragraph_id': 101, 'start_character': 159, 'end_paragraph_id': 101, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Impeachment in the states.:State and territorial officials impeached.:State governors.\n'}]}]