Iran and Israel exchanged fire for a sixth day after US President Donald Trump met with his national security team to discuss the escalating conflict, fueling fresh speculation that Washington is on the verge of joining the attacks.

Conservative and progressive lawmakers want to force a vote on a resolution requiring the administration to seek congressional approval before going to war in the Middle East.

"We now have complete and total control of the skies over Iran," Trump posted on Tuesday, making clear the U.S. and Israel were now in lockstep on the Israeli military operation that the U.S. didn't initially back. "Nobody does it better than the good ol’ USA," he added.