BEIJING -- At the invitation of Gambian President Adama Barrow, Chinese President Xi Jinping's Special Representative and Vice-Chairman of the Standing Committee of the National People's Congress Zheng Jianbang will travel to Gambia from May 4 to 5 to attend the 15th Summit of Heads of State and Government of the Organization of Islamic Cooperation in Banjul, Foreign Ministry Spokesperson Lin Jian announced on Tuesday.