Prince Khalifa bin Salman Al Khalifa died in November 2020. He was the longest serving Prime Minister of which country?

Prince Khalifa bin Salman Al Khalifa died in November 2020. He was the longest serving Prime Minister of which country?

Explanation
  • Khalifa bin Salman Al Khalifa was a Bahraini royal and politician who served as the Prime Minister of Bahrain from 10 January 1970 until his death on 11 November 2020.