Question: what us president had the lowest approval rating
[{'answer': 'Trump', 'provenance': [{'wikipedia_id': '2667864', 'title': 'United States presidential approval rating', 'start_paragraph_id': 3, 'start_character': 230, 'end_paragraph_id': 3, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]