Donald Trump actually said...

The president has no choice at this point but to retaliate against Iran, based on some of the talk that this source heard down at Mar-a-Lago...

If Iran struck any Americans or American assets, that Iran would be hit hard and hit fast.

If Iran does anything, anything, and Iran did something, he would fight back. He would retaliate. He would push back.

He was essentially warning the Iranians that if they were to retaliate, he would strike back.