Hariri arrived in Beirut early on Wednesday after a trip to Cyprus for a meeting with the country’s president, Nicos Anastasiades.
Earlier in the day, he made a brief visit to Egypt for talks with Egyptian President Abdel Fattah el-Sisi.
During a joint presser with Sisi, Hariri thanked Sisi for his support, noting that he would not elaborate on his resignation until he reached Beirut.
He added that both parties had discussed the need for "distancing oneself from regional policies."
"Tomorrow we have independence day in Lebanon, God willing it will be for all Lebanese. Like I said in Paris, my political position will be (clarified) in Lebanon," he added.