Elon Musk is making some big promises while campaigning for former President Donald Trump. But his business record calls into question whether he can deliver.

These questions are being raised on the campaign trail, after VP candidate Tim Walz joked in a speech Tuesday that Musk was effectively Trump’s VP pick. In a made-for-memes moment, Walz wondered why Musk had started “dancing like a dipshit” at the former president’s rallies.

Minnesota Gov. Tim Walz hit out against billionaire Elon Musk, who has become a fixture on the campaign trial with Donald Trump, at a rally on Tuesday. “Elon’s on that stage, jumping around, skipping like a dips–t,” Walz said at the rally in Madison, Wisconsin.