Stephen Colbert Reveals ‘One Of The Most Upsetting Moments Of My Lifetime’

“The Late Show” host Stephen Colbert said Tuesday night’s debate between President Donald Trump and Democratic nominee Joe Biden had a single moment that will stand out in history ― and not in a good way.

Moderator Chris Wallace asked Trump to condemn violent white supremacist groups. Instead, the president urged them to “stand back and stand by.”

Colbert called Trump’s response “one of the most telling, one of the most upsetting moments, not only of the night but of my lifetime.”

Colbert then launched into his Trump impression.

“I don’t support white supremacists,” he said. “I just command them, like a dog, that’s why I’ve got this shiny dog whistle.”

See more of his monologue below:

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This article originally appeared on HuffPost and has been updated.