Question: who becomes the president if the current president is impeached
[{'answer': 'Vice President', 'provenance': [{'wikipedia_id': '174647', 'title': 'United States presidential line of succession', 'start_paragraph_id': 2, 'start_character': 44, 'end_paragraph_id': 2, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]