Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) expressed support for Indigenous Peoples' Day, which is celebrated by many in lieu of Columbus Day to recognize the accomplishments of Native Americans.

"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," the 2020 Democratic hopeful tweeted Monday.

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"We must fulfill our trust and treaty obligations to Tribal Nations. We must protect Tribal sovereignty and self-determination," she added. "And we have to go even further to empower indigenous peoples to build stronger communities and a brighter future."

Warren also promoted a previously released plan that aims to promote improved economic opportunity, housing and health care for Native communities.

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 — Elizabeth Warren (@ewarren) October 14, 2019

We must fulfill our trust and treaty obligations to Tribal Nations. We must protect Tribal sovereignty and self-determination. And we have to go even further to empower indigenous peoples to build stronger communities and a brighter future. https://t.co/WKMjPKTvDu — Elizabeth Warren (@ewarren) October 14, 2019

Warren in the past sparked controversy after she said she had Native American ancestry. Last year, she revealed that a DNA test showed "strong evidence" of the ancestry, prompting criticism from some Native American groups. She has since apologized.

President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE has repeatedly gone after the top-tier 2020 candidate, calling her "Pocahontas."

The second Monday of October, which is federally recognized as Columbus Day, is recognized as Indigenous Peoples' Day in many cities and states, including Washington, D.C.

Fellow 2020 Democratic candidates Julián Castro and Steve Bullock Steve BullockCourt removes Pendley from role as public lands chief On The Trail: Making sense of this week's polling tsunami McConnell locks down key GOP votes in Supreme Court fight MORE also expressed support for Indigenous Peoples' Day on Monday.

Warren is one of the top contenders in the crowded Democratic primary field and will appear in Tuesday night's debate.