The United States women’s hockey team has gained powerful allies.

The team is currently boycotting the upcoming IIHF World Championship in Michigan and demanding equitable support for women’s hockey by USA Hockey. Over the weekend, reports surfaced that the men’s team is considering withdrawing from their own World Championship in solidarity with their women’s team colleagues.

Now, U.S. senators are getting involved. On Monday, Massachusetts senator Elizabeth Warren and her colleagues delivered a letter to USA Hockey executive director Dave Ogrean.

In a statement, the senators (all Democrats) write the USWNT athletes “indeed deserve fairness and respect, and we hope you will be a leader on this issue as women continue to push for equality in athletics.”

Warren and her colleagues also cite federal law, which requires programs like USA Hockey to provide the equitable support the women’s team is requesting.

USAH has an emergency conference call at noon to try and resolve the USWNT boycott. Read about all that's happened: https://t.co/an0HkDdBWr — The Ice Garden (@TheIceGarden) March 27, 2017

The women’s national team outlined their goals when they announced the boycott on March 15. Beyond fair wages (the players earn only $6,000 every four years), the players want to see more developmental support from USA Hockey and marketing efforts.

US WNT will not play in 2017 World Championship due to stalled negotiations over fair wages and support from USA Hockey #BeBoldForChange pic.twitter.com/qEXVyoKE6y — Hilary Knight (@Hilary_Knight) March 15, 2017

USA Hockey spends $3.5 million annually for the men’s national development team program. No such program exists for women’s hockey.

Here’s the full letter the senators sent to USA Hockey executive director Dave Ogrean.