NEW YORK, N.Y. - New England Patriots quarterback Tom Brady must serve a four-game "Deflategate" suspension imposed by the NFL, a federal appeals court ruled Monday, overturning a lower judge and siding with the league in a battle with the players union.

A three-judge panel of the 2nd U.S. Circuit Court of Appeals in Manhattan ruled 2-to-1 that Commissioner Roger Goodell did not deprive Brady of "fundamental fairness" with his procedural rulings. The split decision may end the legal debate over the scandal that led to months of football fans arguing over air pressure and the reputation of one of the league's top teams.

It also fuels a fresh round of debate over what role, if any, the quarterback and top NFL star played in using underinflated footballs at the AFC championship game in January 2015. The Patriots won the contest over the Indianapolis Colts, 45-7, and then won the Super Bowl.

Soon after the ruling, Republican presidential candidate Donald Trump opened a campaign rally in Rhode Island by sticking up for Brady, a longtime friend and golfing buddy.

"First of all let's start by saying leave Tom Brady alone. Leave him alone. Leave him alone he's a great guy," Trump said. "It's enough. It's enough."

The ruling can be appealed to the full 2nd Circuit or to the U.S. Supreme Court, but it would likely be a steep and time-consuming climb even if the courts took the unusual step to consider it.

In a majority opinion written by Judge Barrington D. Parker, the 2nd Circuit said its review of labour arbitration awards "is narrowly circumscribed and highly deferential — indeed, among the most deferential in the law."

"Our role is not to determine for ourselves whether Brady participated in a scheme to deflate footballs or whether the suspension imposed by the Commissioner should have been for three games or five games or none at all.Nor is it our role to second-guess the arbitrator's procedural rulings," the opinion said. "Our obligation is limited to determining whether the arbitration proceedings and award met the minimum legal standards established by the Labor Management Relations Act."

The 2nd Circuit said the contract between players and the NFL gave the commissioner authority that was "especially broad."

"Even if an arbitrator makes mistakes of fact or law, we may not disturb an award so long as he acted within the bounds of his bargained-for authority," the court said.

In a dissent, Chief Judge Robert Katzmann said Goodell failed to even consider a "highly relevant" alternative penalty.

"I am troubled by the Commissioner's decision to uphold the unprecedented four-game suspension," Katzmann said. "It is ironic that a process designed to ensure fairness to all players has been used unfairly against one player."

The NFL Players Association said in a statement it was disappointed.

"We fought Roger Goodell's suspension of Tom Brady because we know he did not serve as a fair arbitrator and that players' rights were violated under our collective bargaining agreement," the statement said. "Our union will carefully review the decision, consider all of our options and continue to fight for players' rights and for the integrity of the game."

NFL spokesman Brian McCarthy said the court ruled Goodell acted properly in cases involving the integrity of the game.

"That authority has been recognized by many courts and has been expressly incorporated into every collective bargaining agreement between the NFL and NFLPA for the past 40 years," McCarthy said.

The appeals ruling follows a September decision by Manhattan Judge Richard Berman that went against the league, letting Brady skip the suspension last season. Goodell insisted the suspension was deserved.

The appeals court settled the issue three days before the start of the NFL draft and well before the start of the 2016 season, avoiding the tension built last year when Brady didn't learn until a week before the season that he would be allowed to start in the Patriots' opener.

At oral arguments in March, appeals judges seemed skeptical of arguments on Brady's behalf by the NFL Players Association.

Circuit Judge Denny Chin said evidence of ball tampering was "compelling, if not overwhelming" and there was evidence that Brady "knew about it, consented to it, encouraged it."

The league argued that it was fair for Goodell to severely penalize Brady after he concluded the prize quarterback tarnished the game by impeding the NFL's investigation by destroying a cellphone containing nearly 10,000 messages.

Parker said the cellphone destruction raised the stakes "from air in a football to compromising the integrity of a proceeding that the commissioner had convened."

"So why couldn't the commissioner suspend Mr. Brady for that conduct alone?" he asked. Parker added: "With all due respect, Mr. Brady's explanation of that made no sense whatsoever."

Parker also was critical of the NFL at the arguments, saying Brady's lengthy suspension seemed at "first blush a draconian penalty."

Troy Vincent, the league's executive vice-president of football operations, handed down the initial suspension to three-time Super Bowl MVP for his role in deflating footballs during the 2015 AFC Championship game against the Indianapolis Colts, which the Patriots won 45-7. Vincent also fined the Patriots $1 million and stripped them of a first-round draft pick next year and a fourth-rounder in 2017. Those penalties stood after the Patriots elected not to appeal them – a decision owner Robert Kraft later openly lamented.

The Patriots will now likely turn to third-year quarterback Jimmy Garoppolo as their starter in Brady's absence. Garoppolo was selected in the second round of the 2014 NFL Draft but has yet to play meaningful snaps as the team's backup. He completed one of four pass attempts last season for six yards. He has completed 20 of 37 career pass attempts in the NFL for 188 yards with one touchdown and no interceptions.

Brady, and the NFLPA, could appeal Monday's ruling to the United States Supreme Court.

Brady, a four-time Super Bowl champion, has been named to seven consecutive Pro Bowls. He is the NFL's active leader in touchdown passes.

The 38-year-old quarterback is slated to miss games against the Arizona Cardinals, Miami Dolphins, Houston Texans and Buffalo Bills in Weeks 1-4. He is eligible to return on October 9 against the Cleveland Browns.

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TIMELINE OF EVENTS INVOLVING DEFLATEGATE

Jan. 18, 2015: Patriots defeat the Colts in the AFC Championship game, 45-7.

Embedded ImageJan. 20, 2015: 11 of the 12 balls used in the first half of game found to be underinflated.

Jan. 23, 2015: Bill Belichick and Tom Brady deny involvement in altering footballs

May 6, 2015: Wells report released with detailed investigation of footballs used during AFC Championship.

May 11, 2015: Tom Brady suspended 4 games, Patriots fined $1M and forfeit 2 draft picks (2016 1st-round pick; 2017 4th-round pick)

July 28, 2015: Brady’s suspension is upheld by Commissioner Roger Goodell.

July 29, 2015: Brady criticizes NFL in Facebook post; Patriots owner Robert Kraft says he regrets cooperating with NFL in investigation; NFLPA filed appeal in Minnesota

Sept. 3, 2015: Judge Berman nullifies 4-game suspension

Nov. 23: A federal appeals court in NY announces that the NFL’s hearing on its appeal will be held March 3, 2016.

Feb. 25: The United States Court of Appeals for the Second Circuit in New York announced the judges who will hear the NFL's appeal of the decision by U.S. District Court judge Richard M. Berman to overturn the league's 4-game suspension of Patriots QB Tom Brady. Chief judge Robert A. Katzmann, judge Barrington D. Parker and judge Denny Chin will preside.

April 25: Brady’s suspension reinstated