HH the Emir Sheikh Tamim bin Hamad al-Thani yesterday received a written message from UAE Vice President and Prime Minister and Ruler of Dubai Sheikh Mohamed bin Rashid al-Maktoum, inviting him to attend Dubai Expo 2020. The message was handed over by UAE ambassador Saleh Mohamed bin Nasra al-Ameri when the Emir met him at the Emiri Diwan  yesterday morning.