RIYADH: His Royal Highness Prince Mohammed bin Salman bin Abdulaziz Al Saud, Crown Prince and Prime Minister, has sent a cable of congratulations to King Tupou VI of the Kingdom of Tonga on his country's National Day. According to Saudi Press Agency, the Crown Prince expressed his wishes for King Tupou VI's continued good health and happiness. He also conveyed his hopes for steady progress and prosperity for the government and people of Tonga.