Justin Gaethje got congratulations messages from all kinds of people following his big win over Dustin Poirier ... but maybe the most notable to call was Donald Trump, who actually sent an invitation to the UFC star to golf with him as part of his well-wishes chat.
Gaethje said the former POTUS gave him a ring shortly after his stunning KO victory on Saturday night ... telling TMZ Sports the call was "awesome."
"He f***ing loves fighting, man," Gaethje said of No. 45. "He loves it."
The 34-year-old tells us ... Trump said he was proud of the performance that Gaethje put on -- while also saying "how impressive of a show it was."
Then, Gaethje said Trump told him he wanted to tee it up with him whenever he's in New York or Florida next.
Of course, the two have formed a good bond over the years ... you'll recall, Gaethe actually attended one of Trump's presidential rallies back in 2020 -- where Trump shouted out him and other UFC fighters in attendance during his speech. Seems their relationship has only grown stronger since.
As for what's next for Gaethje aside from a potential 18 holes with DT ... he told us there are plenty of options on the table -- including Charles Oliveira, Islam Makhachev ... and, yes, maybe even Conor McGregor.
Of the trio, Gaethje seemed to want Oliveira the most (assuming he's able to beat Makhachev in their title fight in October) -- telling us he'd love to avenge the loss he suffered at UFC 274 in 2022.
Then again, Justin says he's down to get in the octagon with just about anybody ... saying, "I like to fight."