A Lebanese lawmaker on Sunday demanded that Hezbollah ministers step down from the cabinet following an indictment of four members of the Shiite militant group over the 2005 murder of former Prime Minister Rafik Hariri.
Future Movement member of parliament Nohad al-Mashnouq was speaking at a meeting in the capital Beirut.
But Hezbollah's leader Sheik Hassan Nasrallah on Saturday vowed never to turn over the four, saying in a defiant speech that "even in 300 years" authorities will not be able to touch them.
The indictments were announced on Thursday.
The Special Tribunal for Lebanon - the UN-backed court tasked with bringing to justice those involved in Hariri's assassination has handed Lebanon's state prosecutor indictments and Lebanon has 30 days to carry out the arrest warrants.
Nasrallah denounced the six-year investigation as a plot by Israel and the United States.
Hezbollah, which gets crucial support from Iran and Syria, has denied any role in the killing and accused the UN-backed tribunal of doing Israel's bidding.
The accusations that Hezbollah - the most powerful political and military force in Lebanon - had a role in the 2005 Beirut truck bombing that killed Rafik Hariri has the potential to plunge Lebanon into a new and violent crisis.
Hezbollah has amassed unprecedented political clout in the government this year, having toppled the previous administration in January when then-Prime Minister Saad Hariri - the slain prime minister's son - refused to renounce the tribunal investigating his father's death.
The new premier, Najib Mikati, was Hezbollah's pick for the post.
He issued a vague promise on Thursday that Lebanon would respect international resolutions as long as they did not threaten civil peace.
The ambiguous wording leaves ample room to brush aside the arrest warrants if street battles are looming.
The cabinet is packed with Hezbollah allies, so there is little enthusiasm within the current leadership to press forward with the case.
Even if Saad Hariri were still in power, however, it's unlikely he would be able to force Lebanese authorities to arrest the men - to do so, they would have to directly confront a well-armed militant group that wields serious power over the Lebanese state.
The bombing that killed Hariri and 22 other people on 14 February, 2005, was one of the most dramatic political assassinations in the Middle East.
A (b) billionaire businessman, Hariri was Lebanon's most prominent politician after the 15-year civil war ended in 1990.
In the six years since his death, the investigation has sharpened some of Lebanon's most intractable issues: the role of Hezbollah and its massive arsenal, and the country's dark history of sectarian divisions and violence.
Rafik Hariri was one of Lebanon's most powerful Sunni leaders; Hezbollah is a Shiite group.