HH the Emir Sheikh Tamim bin Hamad Al-Thani, the Chairman of the current session of the Supreme Council of the Cooperation Council for the Arab States of the Gulf, returned to Doha after a visit to the Kingdom of Saudi Arabia where His Highness participated in the 15th consultative meeting of Their Majesties and Highnesses the leaders of the GCC States, which was held in Riyadh on Tuesday.