Trump posted a video on Monday which featured a clip from a live stream on Warren's Instagram page along with a caption labelling her "Pocahontas".
"Wounded Knee" refers to the 1890 massacre of Lakota Indians by USA troops, while "Bighorn" refers to the 1876 Battle of Little Bighorn, often called "Custer's Last Stand".
Last night, President Donald Trump invoked the massacre at Wounded Knee to mock an Instagram Live video that Sen.
Trump has long called Warren "Pocahontas" as a way of undercutting her claim to Native American heritage in attempting to denigrate her credibility. She also awkwardly thanked her husband, Bruce, for "being here" when he showed up on the video.
"Wounded Knee" refers to an 1890 massacre in which approximately 150 Native Americans were killed. Not to Trump, however, who saw the opportunity to pounce on one of his favorite subjects: Warren's heritage.
Warren, a former Harvard Law School professor, campaigned in 2016 with Democratic presidential candidate Hillary Clinton.
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Trump also referenced the Battle of Little Bighorn, where U.S. Army forces, led by General George Custer, were beaten back by Native Americans, and 268 U.S. soldiers were killed.
Twitter users were quick to call out the President for racism and demand the Tweet be removed.
"We condemn in the strongest possible terms the casual and callous use of these events as part of a political attack", said Jefferson Keel, president of the National Congress of American Indians.
That wasn't Trump's only late-night tweet on Sunday that drew notice for its racial overtones.
After Trump posted the tweets, several people posted their outrage on Twitter. "I'm glad you're here" The president said in a follow-up tweet. After the New York Times broke news that the Federal Bureau of Investigation had launched an inquiry into whether the president was covertly working on behalf of Moscow, The Post's Greg Miller reported that Trump had gone to "extraordinary lengths" to keep his conversations with Russian President Vladimir Putin secret, even from top administration officials.
Trump often has derided Warren for her claim of having Native American ancestry.