A Democratic senator introduced legislation on Monday to prevent U.S. President Donald Trump from using military force against Iran without Congress's authorization, as an escalating battle between Israel and Iran raised fears of broader conflict.

In the wake of a series of strikes by Israel on Iran's nuclear sites, potentially pushing the Middle East to the brink of an all-out conflict, President Donald Trump told ABC News he thought the attacks had been "excellent" and suggested there was "more to come."