Billionaire Mark Cuban is teasing Donald TrumpDonald John Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president MORE about his wealth, sharing a video of Trump "singing" the pop song "Billionaire" by Travie McCoy and Bruno Mars.

Cuban tweeted out a link to the YouTube video Friday morning.

“Why did I do this? Because I can,” he tweeted, adding a smiley face.

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The video shows Trump appearing to sing “Billionaire.” The presumptive GOP presidential nominee’s interview and speech clips were cut and edited together to match the song’s lyrics and played with the music in the background.

The video of Trump “singing” the lyrics — "I wanna be a billionaire so f---ing bad” — comes days after Cuban questioned whether Trump is really as rich as he claims.

Cuban said Trump, who made his money in real estate, is good at putting his name on on buildings — which happens to match another lyric in the song: "I see my name in shining lights."

"He's good at that. Whether or not that's made him a billionaire, I don't know," Cuban said in an interview on WABC’s “The Bernie and Sid Show."

"He's not transparent enough for us to actually know.”

Trump has yet to release his tax returns publicly, prompting speculation by some that he may not be as wealthy as he claims.

On Wednesday, Trump’s spokeswoman denied that Cuban was in consideration to be his vice president.