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!
— Donald J. Trump (@realDonaldTrump) January 5, 2020
This is a declaration by Donald Trump that the Congress has nothing to say about making war — an assertion of king-like power.