During Vice President Kamala Harris’ run for president in the 2020 election cycle, the then-California senator proposed a new health care plan that had potentially high costs for the American middle class.

An archived version of Harris’ campaign website reviewed by Fox News Digital details her "Medicare For All Plan," which Harris, who personally authored the proposal, promised would provide "comprehensive health insurance that covers every American."

Harris cited fellow presidential primary rival Vermont independent Sen. Bernie Sanders' Medicare For All plan as the model for how to pay for her plan, with the then-California senator specifically pointing to an "income based premium paid by employers, higher taxes on the top 1%, taxing capital gains at the same rate as ordinary income, among others."

Harris also provided a link to the Sanders plan, which included a 7.5% payroll tax increase for employers and a 4% increase in income taxes on households making over $29,000.

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closeup Kamala Harris shot

Vice President Kamala Harris. (Win McNamee/Getty Images)

While Harris praised the Sanders plan for having "good options," she accused the Vermont senator of going too far with the 4% tax increase, instead proposing that the new tax only apply to households making over $100,000.

"I would tax Wall Street stock trades at 0.2%, bond trades at 0.1%, and derivative transactions at 0.002%. Think of it like this: that’s a $2 fee on a $1,000 trade by investors and big banks," Harris continued. "I would also end foreign tax shelters by taxing offshore corporate income at the same rate as domestic corporate income. Together, these proposals would raise well over $2 trillion over ten years, more than enough to make up the difference from raising the middle class income threshold."

However, the proposed 7.5% bump to employer payroll taxes and 4% tax hike on households over $100,000 was panned by critics, including those who ended up joining Harris in a future President Biden administration.

Then-Biden Deputy Campaign Manager Kate Bedingfield, who would go on to serve as the White House communications director from 2021-2023, called the plan a "Bernie Sanders-lite Medicare for All and a refusal to be straight with the American middle class, who would have a large tax increase forced on them with this plan."

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Despite Harris’ pledge to target employers and high-income households with the burden, some experts argue the cost would mostly be borne by middle-class workers.

Thomas Savidge, a research fellow at the American Institute for Economic Research, told Fox News Digital that any payroll tax increase to employers is likely to be passed on to employees in the form of lower wages.

Kamala Harris speaking at lectern

Vice President Kamala Harris. (FREDERIC J. BROWN/AFP via Getty Images)

"The cost of payroll tax increases are ultimately borne by employees," Savidge said. "Increases in payroll taxes on employers take money away that could have been used to increase employee pay, offer better benefits, or hire additional staff."

Savidge noted that the 4% increase in income taxes would cover a large percentage of the American middle class and would be especially harmful in the current economic environment, where concerns over inflation already have many tightening their belts and spending less.

According to U.S. Census Bureau data, over 37% of U.S. households make over $100,000 and could be impacted by the tax, representing a large chunk of middle-class workers.

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Savidge also argued that the Harris proposal represents the most "extreme" way to tackle American concerns over the cost of health care, noting that such a plan would distort the market while having significant impacts on wait times and quality of care.

"This is an extreme way to go about it," Savidge said. "It’s going to end up making the problems that we have much worse."

Harris’ current campaign website does not yet include her platform, and the new Democratic nominee also has yet to unveil a new health care plan.

The Harris campaign did not immediately respond to a Fox News Digital inquiry on whether Harris stood by the plan or if she would support one similar to it in this campaign.

JD Vance speaking at press conference

Sen. JD Vance speaks at a press conference on May 13, 2024, in New York. (AP Photo/Stefan Jeremiah, File)

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However, the Harris proposal was slammed by the office of Trump's running mate, Ohio Sen. JD Vance, who the Trump campaign has touted as its "policy attack dog on Kamala Harris." 

"After four years of sky-high inflation rushing household budgets, the last thing the American people need is another tax hike from Kamala Harris, Vance spokesman William Martin told Fox News Digital. "Her middle class tax increase would hit millions of households, and has drawn comparisons to Bernie Sanders from this in her own party. There is no place for her weak, failed and dangerously liberal agenda in the White House."