Justice Antonin Scalia concurred separately.
Justice John Paul Stevens concurred separately.
Justice Breyer, concurring separately, did not sign the Rehnquist opinion.
Along with Justice John Paul Stevens, who concurred separately, these three had dissented in every one of the 11th Amendment immunity decisions.
Justice Clarence Thomas concurred separately, suggesting that the court not foreclose the prospect of upholding a more narrowly drawn law.
Justice Thomas concurred separately, saying the majority had interpreted the Necessary and Proper Clause of the Constitution too expansively.
Justices Antonin Scalia and Clarence Thomas did not sign the majority opinion, instead concurring separately in an opinion by Justice Scalia that was oddly churlish in tone.
Justices Thomas and Scalia concurred separately in an opinion by Justice Thomas that reiterated his longstanding view that the Eighth Amendment applies only to types of punishment and not to particular conditions of confinement.
Judge Aldrich concurred separately, finding that the directed judgment of acquittal had been based solely on the supposed improper conduct of the prosecutor, and agreeing with his colleagues that the district judge was without power to direct an acquittal on that ground.
Scalia joined the majority per curiam opinion in the 2000 case of Bush v. Gore, which effectively ended recounts of ballots in Florida following the 2000 US Presidential election, and also both concurred separately and joined Rehnquist's concurrence.
From Justice Stephen Breyer's statement (via Lawfare): Judge Rogers, separately concurring in the Court of Appeals' judgment on remand, pointed out that petitioners have "received two offers of resettlement in countries [including Palau, which] the United States determined 'appropriate.'" Id., at 1050, n. 3.
