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Unlike any other unclassified, 48-hour War Powers report, this letter does not specify what it is reporting.
The letter neither specifies the groups who attacked US forces nor the groups the US targeted in response.
Background:
First, the report is notable for what it omits--any reference to the strike on Ayman al Zawahiri in Kabul. 
First, like the recent War Powers report, this Article 51 letter only addresses the pre-planned US airstrikes on 23 August. It does not discuss the subsequent two days of fighting which resulted in US casualties and fatalities amongst the "Iran-backed militia groups." 2/n
https://twitter.com/Kyle_Rempfer/status/1438325800508563460Under the War Powers Resolution, if US armed forces are introduced into "hostilities" (eg exchanges of fire) w/o statutory authorization then Congress must be notified w/in 48 hours AND US armed forces must be removed from hostilities after 60 days. (2/9)
https://twitter.com/charlie_savage/status/1435913556940165125These memos are not the only poorly reasoned and potentially dangerous war powers opinions on the books. As I wrote in @just_security, Bill Barr's "Override Opinion" which holds the President has power to override the UN Charter, is another. (2/5)