From Ya Libnan (h/t Samson):
Kuwaiti newspaper al-Anbaa quoted diplomatic sources as saying that Ahmadinejad’s scheduled visit to Lebanon around mid-October was brought up during the recent summit with Assad in Damascus.I couldn't find the original article in al-Anbaa, but I did find that it reported that Iran's Revolutionary Guards were already in Lebanon, preparing to provide security for the visit.
The sources said Assad asked Ahmadinejad why he wanted to visit Lebanon .The Iranian President has reportedly told Assad that the visit was “significant due to the strategic importance of the southern Lebanon .”
At this point, the sources said, Assad advised that Ahmadinejad’s visit should not take place at this time.
Assad, however, also hoped in the event Ahmadinejad went ahead of his visit to tone down his statements during during his visit since Lebanon’s security was very important to Syria’s security interests.
Al-Anbaa said that Ahmadinejad promised Assad at the end of their meeting to “seriously consider” the Syrian president’s recommendations.
If they are armed, and if they are working in southern Lebanon, it sounds like yet another violation of UN Security Council Resolution 1701 which calls for "disarmament of all armed groups in Lebanon, so that, pursuant to the Lebanese cabinet decision of July 27, 2006, there will be no weapons or authority in Lebanon other than that of the Lebanese state."
UNIFIL is reported to be ready to help with Ahmadinejad's security as well, if requested by the Lebanese army.
Some in Hezbollah are threatening to bring down the Lebanese government if the Special Tribunal for Lebanon issues indictments against Hezbollah members. Other scenarios are more frightening.
The common denominator is that Lebanon has lost the ability to govern itself, and the most likely outcome is that southern Lebanon will indeed become Iran's de facto border with Israel.