The "Late Show" host taunts the president with a new chant.
The scheduled blocks of time are apparently intended to help the president "zero in on policy matters."
"He lives in this fantasy world where only his emotions count and therefore only his reality is real."
Huckabee Sanders said she "can't guarantee" that Trump had never used a racist epithet.
"Late Show" takes on the president's demand for an investigation.
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