Megan Kelly on Wednesday bashed President Biden for referring to Donald Trump’s supporters as “garbage” — calling the remark a sign that he is “suffering from dementia.”

In an exclusive interview with The Post, the popular podcaster said the comment was a further sign that the 81-year-old Biden was losing his mental acuity.

“I think Joe Biden is suffering from some dementia which has lowered his inhibitions from saying how he actually feels,” the host of SiriusXM’s “The Megyn Kelly Show” told The Post.

Biden sparked outrage on Tuesday after proclaiming, “The only garbage I see floating out there is [Donald Trump’s] supporters.” 

Kelly compared the comment to other infamous Democratic attacks on Republican voters, noting Barack Obama’s “bitter clingers” jab from 2008 and Hillary Clinton’s infamous 2016 reference to Trump backers as a “basket of deplorables.”

“It was just the latest in a long line of insults that the Democrats have had about Republican voters,” said Kelly, who will cover the election during a live broadcast of her show on SiriusXM and YouTube, starting Tuesday at 8 p.m.

“They’ve been calling Trump a fascist and a Nazi and a white supremacist and and now we’ve devolved into garbage. We’re all garbage — anybody who voted for Donald Trump.”

Biden surrogates on CNN defended the president, saying that the remark was due to his stutter and that his reference to “garbage” was aimed at comedian Tony Hinchcliffe, who joked about Puerto Rico as “a floating island of garbage” during a rally for Trump at Madison Square Garden on Sunday.

Kelly ridiculed that notion, saying that even mainstream news outlets like Axios and the Associated Press didn’t accept the claim.

“I don’t believe for one second that it was a slip of the tongue [or] inadvertent,” Kelly said.

“That’s a bridge too far for us. We’re not going to run that kind of cover for him. We all heard what he said.”

Biden did the Trump campaign a favor by shifting the narrative away from Hinchcliffe’s joke and putting the focus on his comment about Trump voters, according to the former Fox News and NBC “Today” show anchor.

“They were saved by Joe Biden,” Kelly said.

She added that “what’s so beautiful about the controversy is these same media outlets and Democrats who spent 48 hours telling us how deeply wrong it is to refer to any group as garbage…now have a very difficult pivot to make.”