CAIRO (AFP) -- Lebanese Prime Minister Fuad Siniora said that an Arab League initiative aimed at resolving the ongoing political crisis in Lebanon was "the only serious" one.

It is "the only serious initiative that currently exists," Siniora told reporters after a meeting with Egyptian President Hosni Mubarak in Cairo.

"We must continue to encourage this initiative," he said, adding that the League's Secretary General Amr Mussa was ready to travel again to Lebanon to help move the plan forward.

With a political crisis in Lebanon escalating, Mussa tried last month to mediate between the parliamentary majority, which rejects Syrian involvement in Lebanon.

But the mediation efforts did not stem the crisis.

The opposition, led by Shiite group Hezbollah, has staged a sit-in outside the government's main offices in central Beirut since December 1 in its campaign to replace the Siniora government with one in which it would have a minority veto.

Siniora is due to meet Mussa in Cairo on Tuesday, Mussa's chief of staff Hisham Yussef told AFP. The two were due to hold talks in the Egyptian capital on Saturday but the meeting was postponed due to scheduling problems.

Siniora's visit to Egypt is part of a regional tour ahead of a conference in Paris on January 25 to raise economic aid for Lebanon.

The donor conference is expected to be attended by Western countries and oil-rich Arab states which back Siniora's government and its elected anti-Syrian parliamentary majority.

In Riyadh later Saturday, Siniora met Saudi Arabia's King Abdullah to discuss "efforts deployed to resolve the political crisis (and) preparations for the Paris conference," a Saudi official told AFP.

Saudi Arabia is one of Lebanon's principal sources of financial assistance. It will be represented in Paris by Foreign Minister Prince Saud al-Faisal and Finance Minister Ibrahim bin Abdul Aziz al-Assaf.

Siniora was expected Sunday in Kuwait, with visits to follow to Qatar, United Arab Emirates, Oman and Jordan, according to a Lebanese official.