A Hezbollah-backed candidate is poised to take over the role of Lebanese prime minister after voting scheduled for Tuesday.
Sunni telecom billionaire and former Prime Minister Najib Mikati gained majority support in the Lebanese Parliament on Jan. 24.
The United States, which considers Hezbollah a terrorist organization, is concerned about the development.
State Department spokesman P.J. Crowley said Monday, "The larger the role played by Hezbollah in this government the more problematic our [US-Lebanon] relationship will be," Reuters reported.
Hezbollah collapsed the government of Prime Minister Saad al-Hariri earlier this month when 10 Hezbollah-block ministers, and one state minister resigned.
Hezbollah (Party of God), is a Shi'ite Muslim militant group founded in the 1980s to counter an Israeli invasion of Lebanon. The group maintains an anti-U.S. and anti-Israel stance.