A worrisome note in a CBS piece on the growing danger of U.S.-Iran conflict over Iraq, linked to Iran's support to Shia fighters:

The State Department has begun drafting an ultimatum that would tell the Iranians to knock it off - or else.

CBS describes Pentagon planning for a possible military action, saying:

Targets would include everything from the plants where weapons are made to the headquarters of the organization known as the Quds Force which directs operations in Iraq.