President Donald Trump is weighing a critical decision in the days-old war between Israel and Iran: whether to enter the fray by helping Israel destroy the deeply buried nuclear enrichment facility at Fordo,

Oman and Qatar were leading efforts to begin ceasefire talks, while mediators said Iran was open to resuming nuclear negotiations if Israel’s attacks stop.

U.S. President Donald Trump has warned that the full force of the U.S. military is ready to respond if Iran attacks American interests.

The conflict has killed hundreds and wounded more than a thousand since Friday in Iran and killed at least 24 and injured hundreds in Israel. The attack on Iran came amid protracted talks between the U.S. and Iran centered around Iran’s nuclear program.

Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of a conflict between the regional foes that showed no sign of slowing.

The president had opposed Israeli action against Iran but came to believe that Israel had reason to act and that the U.S. would have to lend some support.

"American Forces are maintaining their defensive posture & that has not changed," the chief Pentagon spokesperson said.

What we are seeing now is the rhetoric — and the wisdom — of “America First” become reality in the skies over Tehran.