Bernie Defends Medicare for All Details: 'I Wrote the Damn Bill'

Rep. Tim Ryan, D-Ohio, said Sen. Bernie Sanders', I-Vt., premises in his Medicare for all plan were wrong, and he was not clear on the numbers involved in the plan.

Sen. Sanders shot back: "I do know that. I wrote the damn bill."

Ryan was one of at least four other moderates on stage to attack Sen. Sanders – and Sen. Elizabeth Warren, D-Mass., to a lesser extent – over the single-payer proposal drafted by Sanders and his team.

During another tense exchange over the plan, former Rep. John Delaney, D-Md., suggested Sanders and Warren misunderstood the healthcare system.

"I don't think my colleagues understand the business," Delaney said.

Sanders cut him off, disputing Delaney's framing: "It's not a business."