The former president hit out at the debate’s host as well as almost all the presidential hopefuls who appeared in a rant on his Truth Social account.
His comments came the same day Kelly claimed Trump had ‘lost multiple steps’ mentally during in an appearance on fellow conservative Glenn Beck’s podcast.
Trump, 77, has declined to participate in the debates and so far had refrained from giving his opinion on his fellow hopefuls’ performances.
But he waded in to slam his opponents and the host of ‘history’s lowest rated presidential debate’ after it took place in Alabama on Wednesday.
Trump branded Megyn Kelly the ‘biggest loser’ of the fourth GOP debate, which he was notable absent from
His comments came after Kelly claimed Trump has been weakened by age since his successful 2016 campaign
The two have a rocky history which began after Trump attacked Kelly for putting his derogatory remarks about women to him in a presidential debate in 2015
‘The biggest loser was Megyn Kelly, what the hell happened to her?’ Trump said.
‘She has lost whatever she once had, which wasn’t very much. Some things never change!’
His stern words came just hours after she made a comment about him on Thursday.
In an appearance on fellow conservative Glenn Beck’s podcast, Kelly had said, ‘there’s no question Trump has lost a step – or multiple steps’.
Kelly and Trump previously came to blows during a presidential debate for the 2016 election after Kelly grilled the property tycoon on his attitudes towards women.
A rattled Trump went after the former Fox talk show host over the ‘nasty’ questioning in subsequent interviews, including one with CNN where he said: ‘You can see there was blood coming out of her eyes, blood coming out of her wherever.’
He then boycotted a subsequent debate as Kelly was one of the moderators.
Trump also slammed fellow presidential hopefuls Ron DeSantis, Nikki Haley and Chris Christie’s performance in the debate
The former president took to truth social to delivery a blistering attack on his rivals’ performance and moderator Kelly
The two appeared to have buried the hatchet, with Kelly interviewing Trump earlier this year and even begged him return to the debate stage to shake up the dynamic.
But she’s not the only one in Trump’s crosshairs, with the former president slamming four of his rivals.
‘To begin with, I thought Ron DeSanctimonious was terrible, with his bobble head facial movements & his walking on eggs, but that Sloppy Chris Christie was worse,’ Trump mused.
‘He’s not fit, mentally or physically, to be President plus, he suffers from TDS, or Trump Derangement Syndrome, at levels not seen before.
‘In other words, he is a “sick puppy.” On top of it all, his poll numbers are just 1%, in a class with “Aida” Hutchinson. He’s dead, but so is Ron, whose weird bobbing head and fresh mouth, make his high heels look good – He’s walking on eggs!’
He said that Nikki Haley, who he referred to as ‘birdbrain’ looked ‘different and lost’ but awarded her second place.
He declared Trump-fan Vivek Ramaswamy the winner thanks to his loyalty.
‘Vivek WINS because he thinks l’m great,’ Trump added.
The businessman himself was notably absent once again from the debate in Tuscaloosa.
Trump named Vivek Ramaswamy, an avowed supporter, the winner of the debate due to his loyalty
The public however declared Ron DeSantis the winner of the Republican debate, according to polling data from The Washington Post.
The poll found that 30 percent of respondents thought that the Sunshine State governor won. Former South Carolina Gov. Nikki Haley came in second, at 23 percent, followed by former New Jersey Gov Chris Christie at 19 percent and entrepreneur Vivek Ramaswamy trailing at 16 percent.
However all are being blown out the water by Trump, who continues to dominate the Republican Primary.
According to polling aggregator FiveThirtyEight, Trump is now on track to win around 60 percent of the votes in the contest, which begins with the Iowa Caucus on January 24.