HH the Emir Sheikh Hamad bin Khalifa Al Thani on Friday phoned HRH Prince Nayef Bin Abdulaziz Al Saud congratulating him on his appointment a crown prince to the Kingdom of Saudi Arabia in succession to late HRH Prince Sultan Bin Abdulaziz Al Saud. HH the Emir wished HRH Prince Nayef all success in performing the new missions assigned to him as per such an appointment.