Secretary of State Marco Rubio on Iran: If Iran crosses certain red lines, if its regime does certain things that should not happen, and I'm not going to guess what they are, but you know what they are, obviously the US military, the most capable military in the world, is ready to handle it.
But as of now, there is really no longer any need for larger combat operations, because the blockade and economic sanctions are wreaking havoc on their economy.