Now playing
02:23
Rapinoe: Protest is not comfortable, ever
LYON, FRANCE - JULY 07:  Megan Rapinoe of the USA celebrates after scoring her team
PHOTO: Richard Heathcote/Getty Images Europe/Getty Images
LYON, FRANCE - JULY 07: Megan Rapinoe of the USA celebrates after scoring her team's first goal during the 2019 FIFA Women's World Cup France Final match between The United States of America and The Netherlands at Stade de Lyon on July 07, 2019 in Lyon, France. (Photo by Richard Heathcote/Getty Images)
Now playing
01:09
World Cup fans chant in support of equal pay
PHOTO: CNN
Now playing
01:59
Trump weighs in on equal pay for female athletes
PHOTO: CNN
Now playing
00:54
Rapinoe: We are a proud, strong and defiant group of women
fifa womens world cup roundtable on the field moments football spt intl_00000008.jpg
fifa womens world cup roundtable on the field moments football spt intl_00000008.jpg
Now playing
04:46
WWC 2019 Roundtable: On the field moments
United States
PHOTO: LIONEL BONAVENTURE/AFP/AFP/Getty Images
United States' forward Megan Rapinoe celebrates after scoring a goal during the France 2019 Women's World Cup quarter-final football match between France and USA, on June 28, 2019, at the Parc des Princes stadium in Paris. (Photo by Lionel BONAVENTURE / AFP) (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)
Now playing
01:29
Stars: What would a WWC win mean for USWNT?
PHOTO: CNN
Now playing
02:01
Women's World Cup: Megan Rapinoe 1-on-1
ROTHERHAM, ENGLAND - APRIL 08:  Eniola Aluko in action during the UEFA Women
PHOTO: Michael Regan/Getty Images Europe/Getty Images
ROTHERHAM, ENGLAND - APRIL 08: Eniola Aluko in action during the UEFA Women's European Qualifer between England and Belgium at The New York Stadium on April 8, 2016 in Rotherham, England. (Photo by Michael Regan/Getty Images)
Now playing
02:15
Aluko: 'Bullish' Neville can inspire World Cup glory
EMPOLI, ITALY - JANUARY 18: Christiane Endler of Chile Women throws the ball during the International Friendly match between Italy Women and Chile Women on January 18, 2019 in Empoli, Italy.  (Photo by Gabriele Maltinti/Getty Images)
PHOTO: Gabriele Maltinti/Getty Images Europe/Getty Images
EMPOLI, ITALY - JANUARY 18: Christiane Endler of Chile Women throws the ball during the International Friendly match between Italy Women and Chile Women on January 18, 2019 in Empoli, Italy. (Photo by Gabriele Maltinti/Getty Images)
Now playing
03:37
Christiane Endler's path to France 2019
PHOTO: CNN
Now playing
02:36
Women's World Cup: Alex Morgan 1-On-1
PHOTO: CNN
Now playing
02:14
Women's World Cup: Lucy Bronze 1-on-1
PARIS, FRANCE - JUNE 07: General view inside the stadium during the opening ceremony prior to the 2019 FIFA Women
PHOTO: Robert Cianflone/Getty Images Europe/Getty Images
PARIS, FRANCE - JUNE 07: General view inside the stadium during the opening ceremony prior to the 2019 FIFA Women's World Cup France group A match between France and Korea Republic at Parc des Princes on June 07, 2019 in Paris, France. (Photo by Robert Cianflone/Getty Images)
Now playing
02:40
Women's World Cup excitement: Fact or fiction?
PHOTO: CNN
Now playing
01:36
Women's World Cup: Janine Van Wyk 1-On-1
PHOTO: CNN
Now playing
02:01
Women's World Cup: Maria Jose Rojas 1-On-1
PHOTO: CNN
Now playing
01:46
Women's World Cup: Amandine Henry 1-On-1
PHOTO: CNN
Now playing
01:59
Women's World Cup: Ellen White 1-on-1
PHOTO: CNN
Now playing
01:36
Women's World Cup: Rita Chikwelu 1-On-1
PARIS, FRANCE - DECEMBER 08:  The FIFA Women
PHOTO: Dean Mouhtaropoulos/Getty Images Europe/Getty Images
PARIS, FRANCE - DECEMBER 08: The FIFA Women's World Cup trophy on display during the FIFA Women's World Cup France 2019 Draw at La Seine Musicale on December 8, 2018 in Paris, France. (Photo by Dean Mouhtaropoulos/Getty Images)
Now playing
02:01
FIFA Women's World Cup: Bigger, better, bolder
(CNN) —  

Members of the US women’s soccer team scored one of their goals Friday when a federal judge allowed their gender discrimination lawsuit to proceed as a class action.

The US Women’s National Team’s lawsuit against the US Soccer Federation was filed in March in US District Court in California, with 28 members of the team listed as plaintiffs. A trial is currently scheduled for May 2020.

Friday’s class certification decision allows for members of the USWNT to sue the federation collectively – including any player who reported for national team duty over a specific period of time cited in the lawsuit.

When contacted for reaction, a federation spokesperson said, “U.S. Soccer does not have any specific comment.”

The suit alleges US Soccer’s payment practices amount to federal discrimination by paying women less than men “for substantially equal work and by denying them at least equal playing, training, and travel conditions; equal promotion of their games; equal support and development for their games; and other terms and conditions of employment equal to the MNT.”

The women had met their burden to be treated as a class, the judge ruled.

Molly Levinson, spokeswoman for the players, called Friday’s decision an “historic step forward.”

“We are so pleased that the court has recognized USSF’s ongoing discrimination against women players – rejecting USSF’s tired arguments that women must work twice as hard and accept lesser working conditions to get paid the same as men,” she said.

The argument

In one hypothetical case cited in the lawsuit, if the women’s and men’s teams both won 20 straight games in a season, the women would make 38% what the men do.

Earlier this year, US Soccer said the reigning Women’s World Cup champions earned more than the US Men’s National Team, with US Soccer President Carlos Cordeiro releasing an open letter on Twitter saying that from 2010 through 2018, the federation paid $34.1 million in salary and game bonuses to the women, compared with $26.4 million for the men.

Those figures did not include benefits, such as health care, that the women receive. The federation said US Soccer pays USWNT contracted players a salary to play in the National Women’s Soccer League, while the men are paid by their individual teams.

The women’s and men’s compensation structures are different because they were collectively bargained.

In a July written statement, Levinson called the figures misleading and “utterly false”

America’s women have been far more successful than their male counterparts, winning four World Cups – the most recent last July in France – and four Olympic gold medals.

The USMNT said its players, too, “were not impressed” by Cordeiro’s letter. “The women’s national team players deserve equal pay and are right to pursue a legal remedy from the courts or Congress,” the men’s team said.

USWNT beat Netherlands in Lyon in July to retain the Women
PHOTO: Franck Fife/AFP/Getty Images
USWNT beat Netherlands in Lyon in July to retain the Women's World Cup.

Sponsors have added to the pressure to resolve the equal pay fight, with deodorant brand Secret saying in July that it planned to contribute $529,000 to the USWNT players’ association.

Nike, US Soccer’s biggest partner, has also said it’s a strong advocate for pay equity. “Regarding gender equality, Nike has been an advocate for women and girls in the US and around the world,” a spokesperson said.

Minutes after the USWNT’s World Cup win on July 7, Nike ran a 60-second ad celebrating the team’s victory, centering on the concept that the USWNT’s win is about more than winning a soccer title. However, Nike has been criticized for reducing athletes’ pay during their pregnancies, a practice it said in May it would discontinue.

Visit CNN.com/Sport for more news, features and videos

CNN’s Jason Hanna and Aimee Lewis contributed to this report.