Donald Trump has slammed chat show host Jimmy Fallon over the infamous "hair messing" incident during the 2016 presidential campaign.
In a scathing tweet, the US President told Fallon to stop "whimpering" and "be a man".
The Tonight Show host recently told an interviewer he regretted playfully tousling Trump's hair in the episode as he didn't mean to "normalise [Trump] or to say I believe in his political beliefs".
Trump said Fallon was "taking heat" over the incident as he had privately called him, lauding the episode's "monster ratings".
Hours after the US President's damning tweet, Fallon responded, saying "In honour of the President's tweet I'll be making a donation to RAICES in his name." RAICES Texas is a non-profit firm that provides legal services to immigrants.
The hair-messing TV appearance caused an outcry at the time, with critics accusing Fallon of "humanising" a person who encouraged hateful rhetoric.
Fallon has previously been criticised for not being as political as other US late-night talk show hosts, who regularly use their platforms to take on Trump.