Former Iowa Gov. Tom Vilsack says Massachusetts Sen. Elizabeth Warren’s increase in taxes on wealthy Americans to finance her health care proposal is unrealistic. Warren is promising to spend more than $20 trillion over the next decade to provide government-funded health care to every American without raising middle class taxes. Detailed in a 20-page online post, Warren’s proposal relies on employers transferring to the government nearly all of what they currently spend on private health insurance for employees.

During a panel discussion on rural politics in Iowa today (Friday), Vilsack said Warren’s plan wrongly suggests voters will accept that an increase in her proposed tax on the wealthiest Americans won’t affect their own pocketbooks. Vilsack, a former U.S. secretary of agriculture, says “One sliver of society isn’t going to pay for the rest of us.”

Vilsack, who has not endorsed a candidate, also says it’s unlikely there will be sufficient support in the Senate to pass such a measure, even if Democrats take control of the GOP-controlled Senate after the 2020 elections. Vilsack, who has consulted Warren on rural policy, adds “and then there’s the practical application of getting 60 people in the Senate who are going to vote for this.”