The Trump administration has refused military assistance to Lebanon following the resignation of the country's prime minister amid weeks of protests.
Two U.S. officials told Reuters that the State Department had informed Congress of the decision, although no explanation was given for the detention, according to an official.
The State Department did not immediately return a request for comment from The Hill.
While the reason for the freezing of military aid was unclear, US officials have shown concern about the growing role in the country of Iran-backed Hezbollah political party, identified as a terrorist group by the US
Lebanon has been shaken by weeks of protests , with demonstrators closing major roads over allegations of widespread government corruption and the recently declared tax on calls made through Whatsapp and other messaging services.
The country's prime minister, Saad l-Hariri, resigned on Tuesday and Secretary of State Mike Pompeocalls on country leaders to form fast new government.
An American official told the news service that the withdrawal of US security assistance would likely cause Russia to move in offering assistance in response, bringing the Lebanese government politically closer to the Kremlin.