Which case involved an Establishment Clause challenge to the "under god" provision within the Pledge of Allegiance?

Question

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Newdow v. United States is the case that involved an Establishment Clause challenge to the "under God" provision within the Pledge of Allegiance. Michael Newdow argued that the inclusion of "under God" in the Pledge of Allegiance violated the Establishment Clause of the First Amendment, which prohibits the government from making any law "respecting an establishment of religion."

Which Case Involved an Establishment Clause Challenge to the "Under