The United States would certainly negotiate with Iran when they are ready, U.S. President Donald Trump said.

Axar.az reports citing foreign media that Trump repeated earlier threats that Iran would face "great force" if it took aim at the United States. However, he said he would welcome talks.

"If they call, we will certainly negotiate but that’s going to be up to them. I’d only want them to call if they are ready. If they are not ready, they don’t have to bother," AFP cited the U.S. president as saying.

"With Iran, we’ll see what happens. But they’ve been very hostile," Trump said, adding that Tehran would be making a very big mistake if they did anything. "We’ll have no choice," he stressed.

Trump’s remarks came despite urgings from Tehran on Monday for the United States to treat Iran with respect, not threats of war, in response to the U.S. leader’s comments on Sunday that stoked concerns about a potential U.S.-Iran conflict.