Mark Cuban tells 'faithful soldier' Elon Musk that Trump will eventually turn on him

• Elon Musk shared another post on social media expressing support for Donald Trump.
• Mark Cuban responded that Musk's loyalty to Trump won't be rewarded.

Mark Cuban warned Elon Musk about supporting Donald Trump in a social media post on Sunday, as the online feud between the two billionaires continues.

Musk, who has endorsed the GOP nominee and set up a pro-Trump super PAC, reiterated his support for Trump in a post on X on Sunday morning, accusing the Democratic party of deliberately bringing immigrants into the US and key swing states to bolster support.

"Very few Americans realize that, if Trump is NOT elected, this will be the last election," Musk wrote.

In response, Cuban called Musk a "loyal, faithful soldier" to Trump and warned that his fealty won't always be rewarded.

"Elon, there will come a time when you need something from Donald Trump. You will think you will have earned the right to ask and receive. You have been a loyal, faithful soldier for him. You have supported him politically with 10s of millions of dollars," he wrote. "Then, at the point you need him the most, you will find out what so many before you have learned, his loyalty is only to himself."

Musk didn't respond to Cuban's post, but venture capitalist David Sacks, a Trump supporter and Musk fan, commented: "Classic case of projection. You're describing how you think about politics."

Cuban responded that what he said "has nothing to do with politics."

Musk did not respond to a request for comment from Business Insider.

Cuban and Musk have been in a monthslong feud, largely over politics, on X.

The back-and-forth between the two billionaires started as early as January, when Musk challenged Cuban's defense of diversity, equity, and inclusion (DEI) initiatives.

Musk and Cuban have recently become more vocal online about their politics as the election fast approaches.

Cuban has said he regularly speaks with the Kamala Harris campaign and has become something of a surrogate, going on talk shows to make a case for her fiscal policies.

The Dallas Mavericks owner has even volunteered for a potential spot in a Harris administration.

"It's something I could do to have an impact," he previously told BI.

Musk, on the other hand, has shown a rightward shift in his political stances over the past few years.

After the first assassination attempt on Trump during a Pennsylvania campaign rally in July, Musk announced on X his endorsement of the Republican nominee.

"I fully endorse President Trump and hope for his rapid recovery," Musk wrote.

Cuban did not immediately respond to a request for comment.