Jimmy Fallon has used his Tonight Show monologue to address the Twitter insults President Trump tweeted at him earlier this week.
"When I saw that Trump insulted me on Twitter, I was gonna tweet back immediately," Fallon told viewers.
"But I thought, 'I have more important things to do.' Then I thought, 'Wait...shouldn't he have more important things to do?"
Over the weekend, Trump accused Fallon of ruining his hair and "whimpering" to others about his 2016 interview with the President.
"@jimmyfallon is now whimpering to all that he did the famous "hair show" with me (where he seriously messed up my hair), & that he would have now done it differently because it is said to have 'humanized' me - he is taking heat," Trump tweeted.
"He called and said 'monster ratings'. Be a man Jimmy!"
Fallon fired back, claiming that Trump made up an imaginary phone call between the pair.
"First of all, I've never called this human in my life. I don't have his number, I don't want his number," Fallon said.
"And 'monster ratings'? I've never said 'monster ratings.' I don't know what he's talking about."
The comedian also hit out at Melania Trump, telling her, "I don't think your anti-bullying campaign is working."
The Tonight Show host also denied Trump's claims that his appearance had boosted the late night talk show's ratings.
"By the way, Donald. I don't know if you've seen my ratings the past two years - you didn't help my ratings," he added.
"But really, thanks a lot. Thanks for nothing."
Trump doubled down on his criticism of Fallon during a rally in South Carolina this week, telling the crowd Fallon looked "like a lost soul", and that he should be grateful for Trump's appearance on his show.