Assistant Secretary General of the Arab League Ahmad Bin Hili on Wednesday announced that Secretary General Nabil al-Arabi will visit Damascus next Saturday.   \"Al-Arabi made a phone call with the Syrian Foreign and Expatriates Minister Walid al-Moallem, and met Syria\'s permanent Envoy to the Arab League Yousef Ahmad, agreeing to set the visit on Saturday,\" Bin Hili said.      Syria on Tuesday asked the Arab League Secretary General Nabil al-Arabi to postpone his visit to Damascus for objective reasons he was informed of.