Late-night host Jimmy Fallon hit back at a critical tweet from President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, questioning why Trump was taking the time to go after him on Twitter.

“When I saw that Trump insulted me on Twitter, I was gonna tweet back immediately, but I thought, ‘I have more important things to do,’ ” Fallon said on "The Tonight Show" Monday. “Then I thought, ‘Wait — shouldn’t he have more important things to do? He’s the president! What are you doing? Why are you tweeting at me?' ”

Fallon also disputed a claim in Trump's tweet that the host called the president.

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“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 host noted that the ratings for his show have actually fallen since Trump appeared on the program two years ago.

“By the way, Donald. I don’t know if you’ve seen my ratings the past two years — you didn’t help my ratings,” Fallon said. “But really, thanks a lot. Thanks for nothing.”

Trump went after Fallon in a tweet on Sunday, hitting the host for comments he made in a recent interview about his on-air interview with the president.

Fallon responded by saying he was donating to the immigrant advocacy organization Refugee and Immigrant Center for Education and Legal Services in Trump’s name.

.@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. He called & said “monster ratings.” Be a man Jimmy! — Donald J. Trump (@realDonaldTrump) June 24, 2018

In honor of the President’s tweet I’ll be making a donation to RAICES in his name. — jimmy fallon (@jimmyfallon) June 24, 2018

The late-night host during his latest show also took a swipe at first lady Melania Trump Melania TrumpTrump privately blamed Black Americans for lacking initiative: report The Hill's 12:30 Report: Ginsburg lies in repose Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE’s “Be Best” anti-bullying campaign.

“So Melania, if you're watching, I don't think your anti-bullying campaign is working,” he joked.