President Donald Trump used his Twitter account on Sunday to serve notice on Iran that they can expect retaliation — possibly “disproportionate” — if he feels they are responsible for any attacks on U.S. citizens or American facilities.

After a quiet Twitter morning the president wrote: “These Media Posts will serve as notification to the United States Congress that should Iran strike any U.S. person or target, the United States will quickly & fully strike back, & perhaps in a disproportionate manner. Such legal notice is not required, but is given nevertheless!”

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You can see the tweet below: