US President Donald Trump is facing criticism once again for taunting Democrat Elizabeth Warren over her purported Native American heritage.
On Sunday, Mr Trump said the senator, a 2020 presidential hopeful, should have filmed a commercial "from Bighorn or Wounded Knee" in "full Indian garb".
Wounded Knee was one of the worst native massacres in US history.
Native Americans have decried Mr Trump's language, calling it insensitive and racist.
Mr Trump's barb was a response to an Instagram live by Ms Warren on New Year's Eve, just after she announced she was running for president.
If Elizabeth Warren, often referred to by me as Pocahontas, did this commercial from Bighorn or Wounded Knee instead of her kitchen, with her husband dressed in full Indian garb, it would have been a smash! pic.twitter.com/D5KWr8EPan— Donald J. Trump (@realDonaldTrump) January 14, 2019
Ruth Hopkins, a Sioux writer and tribal attorney, said the president's jibe was "cold, callous and just plain racist".
+300 of my people were massacred at Wounded Knee. Most were women and children. This isn’t funny, it’s cold, callous, and just plain racist. pic.twitter.com/9xgnSUTp4k— Ruth H. Hopkins (@RuthHHopkins) January 14, 2019
One user, a Lakota tribe member and army veteran, was also outraged:
Comrade Trump, Little BigHorn was a battle between warriors and soldiers.— Lakota Man (@LakotaMan1) January 14, 2019
Wounded Knee was a massacre of innocent Sioux women and children.
Pocahontas was raped by a white man when she was only 12 years old.
You. Are. A. Racist. Moron. 🖕🏾#RussianAssetInTheWhiteHouse 🇷🇺 https://t.co/kb9DqjnXwV
Another said she was "angry and sickened" by the president's tweet.
As a Native person, Puyallup Tribe, I can't begin to tell you how angry and sickened I am by this tweet. When the hell will his racism stop??? And for anyone who laughs at his 'joke', a pox on your house. https://t.co/r0tmipo2Qf— Storm Reyes (@StormReyes) January 14, 2019
And Native American Photos, an account sharing historical images, tweeted an image of Wounded Knee survivors, adding: "No comment."
Wounded Knee survivors, Dewey Beard, left and James Pipe-on-Head, right, meet John Collier in Washington D.C., 1938. The government (Bureau of Indian Affairs) offered to pay $1,000 to each person who survived the massacre.— Native American Photos (@NativeAmPhotos) January 13, 2019
Some of Mr Trump's supporters, however, insisted the president was just joking; others pushed back against the idea that the language was racist at all.
So it’s not racist for her to pretend to be Native American to further her career, taking the benefits away from an actual minority but it is racist to call her out for doing it?— Brian V 🇺🇸 (@bveeto) January 14, 2019
At the battle of Little Bighorn in 1876, Lakota Sioux, Northern Cheyenne and Arapaho tribes fought against US cavalry led by Lt Colonel George Custer, leaving hundreds dead, including the colonel.
At Wounded Knee in 1890, as many as 400 unarmed men, women and children were killed by US soldiers. Congress formally apologised to the victims 100 years later, expressing "deep regret" for the massacre.
The president has been censured repeatedly for his Native American jabs at Ms Warren.
He has nicknamed the Massachusetts senator "Pocahontas" - who was the daughter of a 17th century indigenous chief - and used the name to mock her even in front of Native American veterans.
Ms Warren has also dealt with backlash of her own from tribes, after revealing DNA test results she said validated her claim of Native American heritage.
A senior official with the Cherokee Nation responded saying using a test to claim any tribal connection was "inappropriate".
The senator has not claimed to be a citizen of any tribal nation and said she respected the distinction between DNA and tribal affiliation, but the president was quick to taunt her over the test.
Pocahontas (the bad version), sometimes referred to as Elizabeth Warren, is getting slammed. She took a bogus DNA test and it showed that she may be 1/1024, far less than the average American. Now Cherokee Nation denies her, “DNA test is useless.” Even they don’t want her. Phony!— Donald J. Trump (@realDonaldTrump) October 16, 2018
Since 2012, Ms Warren has also denied benefiting from her reported Native American background, when it emerged that she was listed as a minority in a Harvard Law School directory.