The comments came after Lebanon’s Hezbollah group confirmed earlier Saturday that Nasrallah, one of the group’s founders, was killed in Israeli airstrikes on the densely-populated southern district of Beirut the previous day.

Biden on Saturday claimed the killing of Hezbollah leader Hassan Nasrallah "a measure of justice for his many victims, including thousands of Americans, Israelis and Lebanese civilians."

The US president reiterated US support for "Israel's right to defend itself" against Hezbollah, Hamas, the Houthis, and any other Iranian-supported groups.

Biden added that he had directed Defense Secretary Loyd Austin to "further enhance the defense posture of US military forces in the Middle East region to deter aggression and reduce the risk of a broader regional war."

His statement came as the State Department ordered the family members of its diplomats in Beirut to leave while authorizing the departure of some staff "due to the volatile and unpredictable security situation in Beirut."

“Nasrallah, the next day, made the fateful decision to join hands with Hamas and open what he called a ‘northern front’ against Israel,” Biden said in his statement.

On Thursday, Israel's defense ministry said it had secured an $8.7 billion aid package from the United States to support its ongoing military efforts, including upgrading air defence systems.

The Biden administration has approved more than $14 billion in military aid to Tel Aviv since the start of the Israeli genocidal war on Gaza on 7 October, which killed and wounded more than 142,000 Palestinians in the strip.

The Biden administration has been condemned by many in the US and international humanitarian organizations for complicity in the Israeli genocide in Gaza.