CNN's Don Lemon tore into President Trump on Monday night for calling Sen. Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) "Pocahontas" during an event honoring Native American Code Talkers.

On CNN, Lemon showed a past clip of Trump telling Lemon he is "the least racist person that you have ever met."

“Just because you say you’re not racist, doesn’t make it so,” Lemon said after playing the clip.

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“Especially if you say, do and defend racist behavior over and over and over again. Especially if you have lost your credibility by telling countless lies, big and small.”

Trump on Monday honored three Navajos who helped the U.S. Marine Corps develop a secret code during WWII.

"You were here long before any of us were here,” Trump said, standing beneath a portrait of former President Jackson. “Although we have a representative in Congress who they say was here a long time ago. They call her Pocahontas.”

Lemon said on CNN that Trump's remark was met with "stunned silence from everyone in the room."

"Because everyone in that room knew it was a racist slur directed at Sen. Elizabeth Warren," he said.

Lemon also showed a series of past clips in which Trump referred to Warren as "Pocahontas."

Trump has repeatedly used the derisive nickname when talking about Warren, a reference to her claim of Native American heritage.