nasrallah - AP - Sept 24 2010
Fighters stand guard as Hezbollah leader Hassan Nasrallah speaks through a video link on the occasion of Jerusalem Day in Beirut, Lebanon, on September 3, 2010.. Photo by AP
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Hezbollah says it will try to use its position in Lebanon's government to block its funding for a U.N. court investigating the 2005 assassination of former Prime Minister Rafik Hariri.

The possibility that the tribunal could indict members of the Iranian-backed Shiite militant group is fueling Lebanon's worst political crisis in years.

The UN tribunal was established in 2007 to try suspects in the 2005 assassination of Rafik Hariri, father of current premier Saad Hariri. The elder Hariri was killed in a massive bomb blast in Beirut, along with 20 other people.

A top Hezbollah official, Mustafa Badr al-Din, was involved in the murder of the late Lebanese prime minister, Israel Channel 1 reported in July.

Lebanon pays 49 percent of the tribunal's costs, with other U.N. member states providing the remainder. If Lebanon fails to provide its share, other countries would have to step in.

Lawmakers this week delayed a vote on the budget over the dispute. But Prime Minister Saad Hariri - son of the slain ex-prime minister - has insisted it go forward.

Hezbollah spokesman Ibrahim Moussawi confirmed the group's plans on Wednesday.