However, at least so far, Israeli officials say there will be no negotiations with Hezbollah.
The Obama administration backs the unity government of Sleiman, while Syria is allied with Hezbollah.
Lebanon's elected, pro-Western government has long been locked in a power struggle with Hezbollah.
The investigation found no evidence that UNIFIL soldiers had colluded with Hezbollah or even witnessed the kidnapping as some press reports have implied.
It's expected to be highly critical of Halutz and there continues to be fierce public criticism on the way civilian and military leaders managed the war, this past summer, with Hezbollah.
And there seems to have been a decision that Israel will not negotiate with Hezbollah in the case of Lebanon, with Hamas in the case of the captured Israeli soldier in Gaza.
Mr. Mikati, an affluent Sunni businessman, entered Lebanese politics in 2011 when the political faction allied with Hezbollah nominated him as prime minister after forcing the collapse of the secular, pro-Western government of former Prime Minister Saad Hariri.
"This is why back in 1997, we had to evacuate the U.S. Embassy in Tajikistan when the Imam Khomeini Relief Committee moved in next door, and why, 13 years later, the Treasury Department caught the same group in cahoots with Hezbollah, " said Rubin, who recently wrote about the issue for Commentary magazine.
Many in Israel are still upset by Olmert's management of this summer's war with the Lebanese Hezbollah militants.
Two senior Obama administration officials -- Secretary of State Hillary Clinton and Vice President Joe Biden -- have visited Lebanon in recent months, signaling concerns with a possible Hezbollah victory.
Although several European leaders have complained that Israel is using disproportionate force, most of the international communities agrees with Israel, that Hezbollah must be pushed back from Israel's border with Lebanon.
Boucher also said the United States was very concerned about the situation along Israel's northern border with Lebanon and reports that Hezbollah guerillas were gearing up, with help from Iranian arm shipments, for possible attacks on Israel.
The rockets have no guidance system, and have far less explosive power than the larger Katyushas, used with devastating effect by Hezbollah during this summer's war.
The grizzled Arab mercenaries, who'd fled the Hezbollah reoccupation with little more than the clothes on their backs, looked a tad startled in their new flip flops and red-blue board shorts.
So what happens on June 8 when the world wakes up to a Lebanon that sees Hezbollah aligned with Aoun as the majority and Hariri's March 14 bloc as the opposition party?
CNN: Analysis: Hezbollah win could shake Obama Mideast policy
On previous occasions when Lebanese civilians have been injured, Hezbollah has responded with attacks on northern Israel.
As for another bout of internal conflict in Lebanon, where Hezbollah clashed violently with Sunnis and Druze in 2008, there is equally little feeling that the movement is looking to pick a fight, despite deepening sectarian sentiment and political rifts over Syria.
This reasoning stems from the fact that Dbouk was in direct contact with Hassan Hilu Laqis, a Hezbollah agent operating out of Lebanon who managed many of the procurement projects in North America.
Speaking during a panel discussion in Washington Tuesday, McLaughlin, who served as acting director of the CIA in 2004, said direct military action with Iran could grow to involve Hezbollah, the militant group based in Lebanon.
CNN: Former CIA chief: Military is 'bad option' against Iran
Syria was working closely with Saudi Arabia, the regional patron of Mr Hariri and his Sunni community, to find a formula to defuse tensions in advance of indictments which the Special Tribunal for Lebanon (STL) is expected to issue within a matter of days, naming some Hezbollah members in connection with the murder of Lebanese former Prime Minister Rafik Hariri in 2005.
The secretary of state urged Lebanon to stop the activities of Hezbollah guerrillas on the border with Israel and he called on Syria to end its support for the Iranian-backed movement.
Well-trained fighters from the Lebanese Shia Islamist movement, Hezbollah, have joined battle with government forces fighting to regain control of the strategic western town of Qusair, which lies on vital supply routes for both the rebels and the government.
In contrast, Europe could return to an older debate over whether to cut ties with the political wing of Lebanon's Hezbollah.
The Israeli prime minister said the two leaders would discuss Iran and peace negotiations with the Palestinians as well as Syria and Hezbollah.
According to his official biography on the Lebanese army Web site, Suleiman worked closely with the armed wing of the Shiite movement Hezbollah to counter the Israeli occupation of Southern Lebanon.
Some, like Tamara Freedman(ph), a stay-at-home mother with four children, said the army should hit Hezbollah even harder, and Israel should stop worrying about international opinion.
It would also be difficult to find a Sunni political figure willing to serve as prime minister in a Hezbollah-led government since the majority of Lebanon's prominent Sunni politicians are aligned with Hariri's March 14 coalition, which has declared it will not participate in any government if Hezbollah wins.
U.S. officials said Monday that the White House and State Department were preparing statements with the expectation that investigators will make the link to Hezbollah.
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