"Iran's in big trouble. It looks to me that the people are taking over certain cities that nobody thought were really possible just a few weeks ago," Trump said.
Asked on his message to Iran's leaders, Trump said, "You better not start shooting because we'll start shooting too."
"If they start killing people like they have in the past, we will get involved," Trump said.
"That doesn't mean boots on the ground, but it means hitting them very, very hard where it hurts."
