A video appearing to show Mel Gibson saluting Donald Trump has caused a stir on social media, with many people bashing the actor's gesture.

Both Trump and Gibson were in attendance at the T-Mobile Arena in Las Vegas on Saturday night for the UFC 264 event.

Per The Independent, the former president entered the arena alongside UFC president Dana White, prior to the highly anticipated McGregor vs Poirier bout. Despite there being a scattering of boos in the crowd, the 75-year-old was largely met with cheers and chants of "U-S-A".

However, a video from the event has since gone viral on social media, showing the moment 65-year-old Gibson appeared to salute Trump as he entered the arena. As you can see from the video below, Trump doesn't appear to give the Braveheart star much of a reaction, and instead continued to wave at the crowd.

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The video has since been viewed just shy of 1 million times on Twitter, and Snopes has since confirmed that it was, indeed, Gibson in the video. In response, many people not only questioning why Gibson saluted, but others also claimed the move would damage his career.

One Twitter user questioned: "Why did Mel Gibson who never served in the military salute captain bone spur who dodged the draft?"

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"Mel Gibson’s dishonorable salute just got him demoted to the D-List with [Kevin] Sorbo, Scott Baio, and Dean Cain," a second social media user added.

However, others were happy to see Gibson use the gesture to greet Trump, with one person tweeting: "So Actor, Director Mel Gibson was so excited to see President Trump at the fight on Saturday night that he saluted the president as he walked by. Hollywood Liberals went in to full meltdown. Mel is worth $400 million, so what are they going to do? Cancel him? LOL."

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As well as being in the crowd for the event, Gibson also spoke out about the result of the McGregor vs Poirier fight, which saw the 'Notorious One' lose after the first round after doctors prevented him from competing after he suffered a leg injury.

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Gibson called for a rematch between the rivals, explaining that he doesn't care who wins, he just "wants to see a good match".

Featured image credit: Rich Gold / Alamy

Mel Gibson's apparent salute to Donald Trump provokes strong reaction online