Cardinal Bechara el-Rai had planned his visit before Saad Hariri announced his resignation in Riyadh on November 4, throwing Lebanon into crisis.
El-Ra heads the Maronite sect, Lebanon's largest Christian community and the Middle East's largest Catholic church.
He is to depart from Beirut today.
Hariri said yesterday he will return to Lebanon "within days" to resolve issues with the militant group Hezbollah, his rivals in the coalition government.
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