David Plouffe, an adviser to former President Barack Obama who recently joined the Harris campaign, posted on social media: "Now, he seems only comfortable in a cocoon, asking his happy place Fox to host a Trump rally and call it a debate. Maybe he can only handle debating someone his own age.

Exactly. Can you imagine trying to conduct a debate with him at one of his rallies?

Moderator: Would you choose the shark or electrocution?

Trump: I’ll take electrocution every time

Harris: I am the shark