Memories of the dead should "not be desecrated as a rhetorical punch line," said the president of the National Congress of American Indians.
The Fox News program repeated the president's "Pocahontas" nickname for the Democratic senator.
The president fired off tweets referring to Native Americans as “being of Indian heritage,” a term often considered pejorative.
President Trump attacked Elizabeth Warren with a racist joke that culminated with a punchline about sexual assault.
The president said at the Montana rally that he'd offer Sen. Elizabeth Warren $1 million for her favorite charity if she took a DNA test.
“We have a president who can’t make it through a ceremony honoring Native American war heroes without reducing native history... to the butt of a joke."
The true story of Pocahontas is one of rape and abuse — which indigenous women still experience at alarming rates.
Harold Frazier said Trump should also apologize to the nation for his Pocahontas remarks.
"Are you actually this dumb or is it just an act to appear this dumb?"
"What Trump displayed today was an embarrassment to our values," said Tom Perez, chair of the Democratic National Committee.
The president has repeatedly used the term as a nickname for Sen. Elizabeth Warren, because she previously claimed Native American heritage.
In a speech for the NRA, Trump took a swipe at Elizabeth Warren.