Donald Trump has joined the popular video-sharing app TikTok, a platform he once tried to ban while in the White House, and posted from a UFC fight two days after he became the first former president and presumptive major party nominee in US history to be found guilty on felony charges.

“It’s an honour,” Trump said in the TikTok video, which features footage of him waving to fans and posing for selfies at the Ultimate Fighting Championship fight in Newark, New Jersey, on Saturday night. The video ends with Trump telling the camera: “That was a good walk-on, right?”