Current Presidential candidate Donald Trump and former late-night host David Letterman go way back.
Letterman retired from the Late Show in May 2015, just a few weeks before Trump began his campaign.
But in a new interview with the New York Times, Letterman says he no longer finds Trump to be a laughing matter.
He cited the time Trump did a cruel impression of a New York Times reporter with a disability as something that should bar Trump from polite society, let alone the presidency.