The question for this Court, distilled to its essential form, is whether the Constitution, as the Supreme Court declared in Ex parte Milligan, 71 U.S. (4 Wall.) 2, 120 (1866), remains “a law for rulers and people, equally in war and in peace.” And if so, whether it protects Plaintiffs’ right to challenge an Executive Order that in text speaks with vague words of national security, but in context drips with religious intolerance, animus, and discrimination. Surely the Establishment Clause of the First Amendment yet stands as an untiring sentinel for the protection of one of our most cherished founding principles—that government shall not establish any religious orthodoxy, or favor or disfavor one religion over another. Congress granted the President broad power to deny entry to aliens, but that power is not absolute. It cannot go unchecked when, as here, the President wields it through an executive edict that stands to cause irreparable harm to individuals across this nation. Therefore, for the reasons that follow, we affirm in substantial part the district court’s issuance of a nationwide preliminary injunction as to Section 2(c) of the challenged Executive Order.