U.S. President Donald Trump suggested Sunday that American forces "could get involved" in the intensifying military conflict that Israel started late last week with a barrage of attacks on Iran, prompting large-scale retaliatory strikes and grave warnings of a prolonged and catastrophic war.

CONFLICT ENTERS FOURTH DAY: Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

A Democratic senator introduced legislation to prevent President Donald Trump from using military force against Iran without Congress's authorization.

The United Nations General Assembly on Thursday overwhelmingly demanded an immediate, unconditional and permanent ceasefire in the war in Gaza and aid access, after the United States vetoed a similar effort in the Security Council last week.

Iran has vowed to avenge the Israeli attacks, stating that its response will be anything beyond what Israel and ally, the United States, could ever imagine, triggering the fears of a full-scale Iran-Israel war.

A sudden and powerful Israeli airstrike hit targets in Iran late Thursday, triggering explosions around Tehran and sparking fears of a broader region