It is the latest step in a long battle between the USWNT and their employers US Soccer over equal pay with the US Men's National Team (USMNT).
The women's team says they are required to perform the same responsibilities as the men's team, but have been consistently paid less money, despite having more success on the field.
USWNT have won four of seven Women's World Cup, most recently retaining the trophy after going unbeaten in the France-hosted 2019 tournament.
In comparison, USMNT have reached the World Cup quarter-finals just once in the modern era and failed to qualify for the most recent tournament, in Russia in 2018.
USWNT had filed a gender-discrimination lawsuit against the US Soccer Federation (USSF) in March 2019, but lost a significant ruling in May 2020. A federal judge in California sided with USSF over a number of key points.
A trial is scheduled to begin on September 15, delayed from June following the court's ruling that US Soccer did not violate the Equal Pay Act.
Thirty-three women are named as plaintiffs in the suit, including World Cup stars Megan Rapinoe and Alex Morgan.