The US believes Iran is still prepared to do something if they choose to, White House national security spokesman John Kirby told reporters on Friday, referring to Iran's promised attack against Israel.

"The US continues to monitor Iran, and is not taking anything for granted," Kirby added.

Kirby's comments came shortly after a phone call between US Secretary of Defense Lloyd Austin and his Israeli counterpart Yoav Gallant, during which they discussed "continued exchanges of fire on the Israel-Lebanon border and the risk of escalation from Iran, Lebanese Hezbollah, and Iran-backed terrorist groups across the Middle East.

"I confirmed the US commitment to Israel’s security and shared that the US is well postured across the region to defend Israel and protect US personnel and facilities," Austin said in a Friday tweet about his Thursday conversation with Gallant.