                       Cite as: 572 U. S. ____ (2014)                              1

                          Statement of BREYER, J.

    NOTICE: This opinion is subject to formal revision before publication in the
    preliminary print of the United States Reports. Readers are requested to
    notify the Reporter of Decisions, Supreme Court of the United States, Wash-
    ington, D. C. 20543, of any typographical or other formal errors, in order
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SUPREME COURT OF THE UNITED STATES
 ABDUL AL QADER AHMED HUSSAIN, PETITIONER

     v. BARACK H. OBAMA, PRESIDENT OF

          THE UNITED STATES, ET AL. 

   ON PETITION FOR WRIT OF CERTIORARI TO THE UNITED 

     STATES COURT OF APPEALS FOR THE DISTRICT OF

                   COLUMBIA CIRCUIT

                  No. 13–638.       Decided April 21, 2014


   The petition for a writ of certiorari is denied.
   Statement of JUSTICE BREYER respecting the denial of
certiorari.
   The Authorization for Use of Military Force (AUMF),
passed in September 2001, empowers the President to “use
all necessary and appropriate force against those nations,
organizations, or persons he determines planned, author-
ized, committed, or aided the terrorist attacks that oc-
curred on September 11, 2001, or harbored such organiza-
tions or persons, in order to prevent any future acts of
international terrorism against the United States by such
nations, organizations or persons.” §2(a), 115 Stat. 224.
In Hamdi v. Rumsfeld, 542 U. S. 507 (2004), five Members
of the Court agreed that the AUMF authorizes the Presi-
dent to detain enemy combatants. Id., at 517–518 (plural-
ity opinion); id., at 587 (THOMAS, J., dissenting). In her
opinion for a plurality of the Court, Justice O’Connor
understood enemy combatants to include “an individual
who . . . was part of or supporting forces hostile to the
United States or coalition partners in Afghanistan and
who engaged in an armed conflict against the United
States there.” Id., at 516 (internal quotation marks omit-
2                    HUSSAIN v. OBAMA

                    Statement of BREYER, J.

ted). She concluded that the “detention of individuals
falling into the limited category we are considering, for the
duration of the particular conflict in which they were
captured,” is “an exercise of the ‘necessary and appropriate
force’ ” that Congress authorized under the AUMF. Id., at
518 (emphasis added). She explained, however, that the
President’s power to detain under the AUMF may be
different when the “practical circumstances” of the rele-
vant conflict are “entirely unlike those of the conflicts that
informed the development of the law of war.” Id., at 521.
   In this case, the District Court concluded, and the Court
of Appeals agreed, that petitioner Abdul Al Qader Ahmed
Hussain could be detained under the AUMF because he
was “part of al-Qaeda or the Taliban at the time of his
apprehension.” 821 F. Supp. 2d 67, 76–79 (DDC 2011)
(internal quotation marks omitted; emphasis added);
accord, 718 F. 3d 964, 966–967 (CADC 2013). But even
assuming this is correct, in either case—that is, irrespec-
tive of whether Hussain was part of al Qaeda or the Tali-
ban—it is possible that Hussain was not an “individual
who . . . was part of or supporting forces hostile to the
United States or coalition partners in Afghanistan and
who engaged in an armed conflict against the United
States there.” 542 U. S., at 516 (emphasis added).
   The Court has not directly addressed whether the
AUMF authorizes, and the Constitution permits, deten-
tion on the basis that an individual was part of al Qaeda,
or part of the Taliban, but was not “engaged in an armed
conflict against the United States” in Afghanistan prior to
his capture. Nor have we considered whether, assuming
detention on these bases is permissible, either the AUMF
or the Constitution limits the duration of detention.
   The circumstances of Hussain’s detention may involve
these unanswered questions, but his petition does not ask
us to answer them. See Pet. for Cert. i. Therefore, I agree
with the Court’s decision to deny certiorari.
