Don't know if this has been posted before so here it is.. Pic related
https:// www.law.cornell.edu/wex/commander_in_chief_powers
The terrorist attacks of September 2001 created new complications for the separation of powers within the war powers sphere.
After September 11, the United States Congress passed the Authorization for Use of Military Force against Terrorists (AUMF).
While the AUMF did not officially declare war, the legislation provided the President with more authority upon which to exercise his constitutional powers as Commander in Chief.
As the U.S. Supreme Court explained in Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952) Presidential Commander in Chief powers increase when Congressional intent supports the actions taken by the Commander in Chief. The AUMF served as that expression of Congressional intent.
AUMF authorizes the President to use “all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committeed, or aided in the Sept. 11 attacks."
https:// www.congress.gov/107/plaws/publ40/PLAW-107publ40.pdf
"SEC. 2. AUTHORIZATION FOR USE OF UNITED STATES ARMED FORCES.
(a)IN GENERAL.—That the President is authorized to use all
necessary and appropriate force against those nations, organiza-
tions, or persons he determines planned, authorized, committed,
or aided the terrorist attacks that occurred on September 11, 2001,
or harbored such organizations or persons, in order to prevent
any future acts of international terrorism against the United States
by such nations, organizations or persons."