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.), a 2020 White House hopeful, on Monday acknowledged the controversy over her claim of Native American heritage, saying she has made "mistakes."

“Like anyone who's been honest with themselves, I know that I have made mistakes," Warren told attendees at the Frank LaMere Native American Presidential Forum in Sioux City, Iowa.

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"I am sorry for harm I have caused. I have listened and I have learned a lot, and I am grateful for the many conversations we have had together," she added.

Warren faced backlash late last year when she released results of a test that demonstrated she was between 1/64 and 1/1028 Native American. She has since apologized repeatedly for the confusion caused when she identified herself as a Native American.

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 seized on the controversy, labeling the senator as "Pocahontas."

"I did the Pocahontas thing. I hit her really hard and it looked like she was down and out but that was too long ago," Trump said at a rally last week. "But don't worry, we will revive it. It can be revived. It will be revived and it can be revived very easily and very quickly and we're going to have some fun in the state of New Hampshire."

Warren last Friday released an in-depth plan on aimed at aiding Native American communities by addressing the economy, infrastructure and epidemic of missing and murdered native women on tribal lands.

The intended legislation was drafted with Rep. Deb Haaland Debra HaalandHispanic caucus report takes stock of accomplishments with eye toward 2021 Rep. Robin Kelly enters race for Democratic caucus vice chair OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-N.M.), one of the first two Native American women elected to Congress last year.

Haaland introduced Warren on Monday, and addressed the controversy over the senator's heritage, saying that when the media focuses on the matter rather than issues impacting Native American communities, it is only "feeding the president's racism."

— This report was updated at 12:15 p.m.