US soccer players speak out on equal pay suit: 'We're on the right side of this'

Members of the U.S. Women's National Team say they know they are on the "right side" of fighting for equal pay with their new lawsuit that blasts soccer's national governing body for allegedly paying mere "lip service" to gender equality and dishing out markedly more pay to the men's team.

"We know in our hearts, and we know with the facts that we have, that we're on the right side of this," Megan Rapinoe, a star forward for the team, said Monday on "Good Morning America." "I don't think anyone can argue that there's gender inequities in this world, that there's a pay gap, that there's pay discrepancies."

Rapinoe and her teammates on the world champion U.S. Women's National Team (USWNT) sued the United States Soccer Federation (USSF) Friday for gender discrimination. The lawsuit comes just three months before Team USA -- the winningest team in women's World Cup history -- prepares to defend its title at the FIFA World Cup in France.

Rapinoe and her teammate Alex Morgan, also a forward, said they have no plans to boycott the World Cup while the lawsuit plays out in court.

"I don't think it's ever been in our minds to step off the field," Morgan said. "We've been looking forward to the World Cup for three years now ... We want to continue to play for our country at the highest stage this summer in France."

The USWNT is not the only women's team fighting for equal pay and conditions. The women's national hockey team has been on its own mission, following the soccer team and spurred by its victory at the 2018 Winter Olympics.

Similarly, professional female athletes in tennis and basketball have also been making calls for equal pay, prize money, conditions and infrastructure.

Rapinoe said she hopes the USWNT's lawsuit sends a message to women to "fight for what you believe in."

"The big picture ultimately is just giving that message that you should fight for what you believe in. You should fight for what you feel you earn and never give up," she said, acknowledging that the fight is "difficult at times."

"For us, it's not only about leaving our sport in a better place, leaving it better for the young girls that will come after, but just in general, inspiring women around the world to stand up for what they believe in," Rapinoe said. "They have an ally in us. We are with them. we support them and we will continue this fight as long as we need to."

Morgan spoke about the support the USWNT has felt in their fight, including from the U.S. men's team.

"The men have also come out and said that they are in support of us as well, and so we respect them so much for that," she said. "It's great to see that support from them, from a lot of our sponsors as well, from women all around the world, both inside and outside of the sport."

"You know that you're doing something right when you gain that support from people around you to help lift you up," Morgan added.

ABC News' Alexandra Svokos contributed to this report.