Noam Chomsky has message for Trump apologists and normalizers post-election.

"They're making a bad mistake," Chomsky said in an interview with Al Jazeera’s Mehdi Hasan.

While Chomsky initially backed Bernie Sanders in the primaries, he encouraged his supporters to back Clinton once she received the nomination.

"There are two issues. One is kind of a moral issue," Chomsky told Hasan. "Do you vote against the greater evil if you don't happen to like the other candidate? The answer to that is yes, if you have any moral understanding, if you want to keep the greater evil out."

"How did Trump and Clinton compare? I think they're very different. I didn't like Clinton at all, but her positions are much better than Trump's on every issue I can think of," he admitted.

Chomsky also rebuked leftists' claims that a Trump presidency could "shake up the system" and therefore be positive.

"It was the same point people like [Slavoj Å½iÅ¾ek] said about Hitler," he said about the left-wing philosopher who endorsed Trump."He'll shake up the system in bad ways."

"If Clinton had won – she had some progressive programs," he continued. "The left could have been organized to keeping her feet to the fire and pushing them through. What it will be doing now is protecting rights that have already been achieved from being destroyed. That's completely regressive."

Watch: Exclusive excerpt of Noam Chomsky's post-election interview with Al Jazeera