"I don't believe it is appropriate to use a racial slur in any context".
She also defended the decision to honor the Navajo veterans near a portrait of Andrew Jackson, who is widely reviled by Native Americans. "They call her Pocahontas". "I like you, because you are special".
White House press secretary Sarah Huckabee Sanders used that as a defense of Trump's comment at the Monday press briefing.
Donald Trump's least presidential moments so far.
During remarks praising their service, he said: "You were here long before any of us were here".
Bullet-ridden Body of Missing Army Jawan Recovered From J&K's Shopian
The jawan was on leave when he was abducted by militants in Shopian, officials said. Dar was resident of a nearby village called Sanzan in Shopian district.
Warren said Tuesday that all Trump "had to do was make it through the ceremony".
"This moment in history won't overshadow the contribution the Code Talkers made and continue to make to our nation", Mr Udall wrote on Twitter.
One voice that has been missing in the debate has been that of the code talkers honored in the ceremony.
"If some Native Americans were offended by the use of this term, I'm sorry that they're so wrong", the expert said. Every day brings a new disturbing action by this man we call president.
Warren responded to Trump on MSNBC after the event, saying that it was "deeply unfortunate that the president of the United States can not even make it through a ceremony honoring these heroes without having to throw out a racial slur".
"I think what most people find offensive is Senator Warren lying about her heritage to advance her career". Look, Donald Trump does this over and over thinking somehow he's going to shut me up with it.
"Pocahontas is a real person", Begaye continued. Scott Brown (R), the Boston Herald found that she was listed as a "minority law teacher" in law school directories from the Association of American Law Schools from 1986 to 1995.