The American Civil Liberties Union of Minnesota (ACLU) sued public charter school Tarek ibn Ziyad Academy (TIZA) and other defendants for violations of the Establishment Clause. Parents of students who attend TIZA moved to intervene on behalf of their children, but the district court 1 held that the parents did not have standing and alternatively denied their motion as untimely. The parents appeal, and although we conclude that the parents have standing, we affirm the district court’s denial of the parents’ motion.
I.
TIZA, a public charter school formed under Minnesota Statute section 124D, seeks to provide an alternative educational environment directed at accommodating students with cultural ties to Africa, Asia, and the Middle East. The ACLU contends that the methods TIZA employs to accomplish its objective violate the Establishment Clause of the United States and Minnesota Constitutions. The ACLU filed suit against TIZA on January 21, 2009, alleging that TIZA promotes or prefers the religion of Islam, pointing to, among other things, the suspension of classes for daily and weekly prayer, the serving of food in the school cafeteria in conformity with Islamic dietary restrictions, recognition of religious holidays on the school calendar, dress restrictions in conformity with Islamic rules, the permitting of religious materials being posted in school hallways and classrooms, and the providing of school transportation only after a religious studies program concludes in the afternoon.
On March 5, 2010, fourteen months after the action was commenced, parents of Muslim children who attend TIZA moved to intervene under Federal Rule of Civil Procedure 24, either as a matter of right *1092 under 24(a) or permissively under 24(b). The parents asserted that the First Amendment either permits or requires TIZA to provide the accommodations challenged by the ACLU as unconstitutional. The district court denied the parents’ motion to intervene, holding that the parents did not have Article III standing because their alleged injuries were hypothetical. The district court further held that even if the parents did have standing, the motion to intervene was untimely. The parents appeal. 2
II.
We first address whether the parents have Article III standing.
Browm v. Medtronic, Inc.,
When a party opposes a motion to intervene on the basis of standing, the prospective intervenor must allege facts showing the familiar elements of Article III standing.
Metro. St. Louis Sewer Dist.,
First, the parents have alleged an injury in fact. An injury in fact means an invasion of a “legally cognizable right,”
Braden v. Wal-Mart Stores, Inc.,
The parents have also alleged facts showing that the injury is imminent. They allege that if the ACLU wins on the merits, they will suffer an injury because TIZA will immediately stop providing them with constitutionally required religious accommodations.
See South Dakota v. Ubbelohde,
Second, the parents have alleged an injury fairly traceable to the defendant’s conduct by asserting that if TIZA discontinues the practices challenged by the ACLU, their personal religious freedoms will be directly affected.
See McGowan v. Maryland,
Finally, the parents have shown redressability because the injury alleged— impingement of religious freedom if TIZA stops providing the accommodations challenged by the ACLU — would be redressed by a judicial determination that the policies are permitted under the Establishment Clause. Accordingly, the parents have standing to intervene.
III.
The parents moved to intervene both as of right and permissively. Fed.R.Civ.P. 24(a), (b). Whether a person moves for “intervention of right” or for “permissive intervention,” the motion must be timely. Fed.R.Civ.P. 24;
see also NAACP v. New York,
Although the timeliness of a motion to intervene is a decision within the district court’s discretion,
Minn. Milk Producers Ass’n v. Glickman,
Here, the district court considered these factors and found that based on the circumstances, the motion was not timely. The court listed the relevant factors and acknowledged that timeliness is determined from all the circumstances. The court observed that even though the parents knew of the suit from its inception, they filed their motion to intervene fourteen months after the ACLU filed suit and more than a month after the deadline to add parties. The court emphasized that the parents offered no adequate explanation for the lengthy delay. 3 Finally, the court stated that the delay would prejudice the existing parties because they had already engaged in extensive motion practice, commenced written discovery, and begun taking depositions.
The parents contend that the district court abused its discretion by finding that the fact that extensive motion practice and some discovery had occurred during the parents’ delay in moving to intervene would prejudice the existing parties.
4
The parents reason that because their legal theories arise from the same set of facts already in issue, their delay caused no prejudice to the existing parties despite the motion practice and discovery the parties had completed. The introduction of a new legal theory, however, could change the parties’ respective strategies or framing of the issues during preliminary motion practice as readily as separate factual circumstances could. This is particularly true here, where although TIZA introduced the Free Exercise Clause defensively in its amended answer, the parents’ respective claims of constitutional entitle
*1095
ment to TIZA’s practices would require individualized legal inquiry.
See Harris v. McRae,
In addition, when the discovery schedule is set, written discovery has commenced, and some depositions have been taken in a lawsuit, the addition of new parties often results in some prejudice to the existing parties, though perhaps slight here.
See League of United Latin Am. Citizens v. Wilson,
Moreover, even absent any prejudice, the district court was free to conclude that given the progress of the litigation, the parents’ knowledge of it, and the parents’ failure to adequately explain the delay, the motion was untimely.
See, e.g., Arrow v. Gambler’s Supply, Inc.,
Because the district court correctly stated the legal standard and considered all the relevant factors, we must find that the district court made a clear error of judgment in order to reverse.
See Verizon Commc’ns,
Finally, the ACLU filed a motion to supplement the record on appeal with developments in the factual record before the district court. Generally, we cannot consider evidence that was not contained in the record below when the district court rendered its decision.
Allen v. U.S. Air Force,
IV.
We affirm the district court’s denial of the parents’ motion to intervene.
Notes
. The Honorable Donovan W. Frank, United States District Judge for the District of Minnesota.
. The district court's order denying the parents' motion to intervene of right is immediately appealable as a final judgment.
South Dakota ex rel. Barnett v. U.S. Dep’t of Interior,
. The parents contend for the first time on appeal that the reason they delayed in intervening was, in part, that TIZA’s insurance company assumed responsibility for defending TIZA in the case and replaced TIZA's original attorney "with counsel appointed and controlled by the insurance company.” (Appellant’s Opening Br. at 45.) The parents then wished to hire the attorney who originally represented TIZA because they believed the new attorney would be interested primarily in protecting the institutional and financial interests of the school rather than defending the school’s operational practices. (Appellant’s Reply Br. at 31.) We decline to address these arguments because they were not presented to the district court.
Campbell v. Davol, Inc.,
. The parents also argue that "it is an abuse of discretion for a district court to deny intervention on timeliness grounds to otherwise qualified persons with significant rights at stake in the litigation unless their delay caused genuine prejudice to the parties.” (Appellants' Opening Br. at 43.) We have consistently held, however, that the district court should consider all of the circumstances-no one factor is dispositive.
See, e.g., United States v. Ritchie Special Credit Invs.,
