The Tweet is of an article from May 2018 (not your fault), but the Tweeter should have mentioned that before it zooms across the interwebs.
Heres the May 2018 source. Interesting comments about Obama & Kerry traveling around before the real...
This appears to be a sort of another Baghdad Bob sort of Iraqi threat, esp. since it has not yet been carried out. It would surely be self-defeating for Iranian puppets in Iraq, in any event.
It also occurs to me that by now, Pres. Trump must surely have this info., which leads to a number of interesting thoughts and questions.