While speaking on The Joe Rogan Experience podcast, billionaire Elon Musk didn’t hold back when criticizing singer and actress Jennifer Lopez.

Musk took issue with Lopez’s appearance at Kamala Harris’ Las Vegas rally during the presidential campaign.

A known ally of Donald Trump, Musk was quick to “fight back” by bringing up J.Lo’s past relationship with Sean “Diddy” Combs—who is currently in federal custody at Brooklyn’s Metropolitan Detention Center as he awaits trial on charges of s*x trafficking and racketeering. Lopez and Combs were a couple from 1999 to 2001.

The SpaceX owner cast doubt on the singer’s credibility.

“J.Lo was like his ex-girlfriend and it’s like now deciding she’s like warning people against Trump,” Musk told Rogan. “How many people did she warn against Diddy, right? Oh zero, okay. Maybe we shouldn’t trust her opinion.”

He went on to say, “People in the music entertainment industry had to know that Diddy was like abusing, you know, kids basically and yet they still fed him kids. Like, where’s the accountability? They had to know.”

Lopez didn’t hold back in her support for Harris, urging people not to vote for Donald Trump. Her reaction came after comedian Tony Hinchcliffe, a known Trump supporter, made offensive remarks about Latinos during a rally.