The Working Families Party on Monday called on supporters to back changing Columbus Day to Indigenous People’s Day — just hours after the 2020 Democratic candidate the group is backing, Elizabeth Warren, also called for the change.

Warren has come under fire for claiming native American ancestry, leading President Trump to mock her as “Pocahontas.”

“Add your name if you agree: Columbus Day should be changed to Indigenous People’s Day. Christopher Columbus was a rapist, a murderer, and a tyrant, and is responsible for the Atlantic slave trade and genocide against indigenous people. So rather than have a day honoring the 500 years of colonial oppression that he spearheaded, we think it’s long past time to celebrate the indigenous people whose land he stole and their resiliency in the face of oppression instead,” the petition the WFP forwarded to supporters says.

Warren, the Massachusetts senator, in a tweet earlier Monday said, “The story of America’s mistreatment of indigenous peoples is long and painful. And yet, Native communities have proven resilient. We owe them our respect — and we must honor our government’s commitments and promises to them. #IndigenousPeoplesDay.”

California Sen. and presidential candidate Kamala Harris also supports Indigenous Peoples Day as a counter to Columbus Day, a federal holiday celebrating the Italian explorer since 1938.

More states are ignoring the Columbus holiday to celebrate Indigenous Peoples Day on the same day, recognizing native Americans’ histories and cultures.

The alternative to Columbus Day is gaining steam.

A dozen states and the District of Columbia now celebrate Indigenous Peoples Day, including most recently Vermont, Maine, Louisiana, Michigan and New Mexico.

South Dakota was the first state to recognize Indigenous Peoples’ Day in 1990.