How? Well, with the 2026 World Cup coming to the United States as part of a joint bid with Canada and Mexico, Manchin's bill would seek to cut off any federal funding that would go towards the event.
The team stormed to their fourth World Cup triumph with a 2-0 victory against the Netherlands last weekend and they have returned home to a heroine's welcome in the Big Apple, where city officials have arranged the parade for fans of the team to pay tribute to Megan Rapinoe and co.
The bill would withhold federal funds from efforts related to the United States' hosting of the 2026 World Cup until the U.S. Soccer Federation agrees to give its national women's and men's teams the same compensation.
In addition to bringing in more World titles than the men, for the past three years, the USA women's soccer team has brought in more revenue at $50.8 million compared to $49.9 million.
But it's not just United States Soccer that is in need of a rethink - there is also a massive disparity in the prize money offered by Federation Internationale de Football Association to the winners of the men's and women's World Cups.
Manchin, who is from West Virginia, introduced the bill after he received a letter from West Virginia University Women's Soccer head coach Nikki Izzo-Brown which highlighted her anxious about players on her team one day making the USWNT and not getting paid the same amount as men.
Under the current system, the United States men's team has the capacity to earn more money than the women's thanks to the higher win bonuses on offer to male players.
"I believe first hand, it is wrong for the U.S. Soccer women to be paid and valued less for their work because of gender", Izzy-Brown wrote.
Many noted the "equal pay" chants at the World Cup final, and the USWNT has been trying to force the issue for some time. Others fired back that the men's World Cup previous year generated $6 billion, of which the participants split $400 million, or about 7 percent of the total revenue.
"What are we going to do about it? That's just plain wrong", Manchin said in a statement.
The match averaged 589,000 viewers online - 289,000 on Fox apps and 300,000 on NBC and Telemundo apps - which makes it the most-streamed Women's World Cup match ever.