This post has been updated with comment from the Sanders campaign.

Health care has been a contentious topic among the Democratic presidential candidates: Sens. Bernie Sanders (I-VT) and Elizabeth Warren (D-MA) support Medicare for All while Mayor Pete Buttigieg (D-IN) and former Vice President Joe Biden offer alternatives to universal health care.

A new analysis from the Committee for a Responsible Federal Budget (CRFB) took a look at the different plans and found that while each proposal would reduce the number of uninsured Americans, the least costly would be Buttigieg’s plan.

“Mayor Buttigieg’s plan would reduce deficits by $450 billion,” according to CFRB, adding that the policy would also “increase gross spending by $2.85 trillion, reduce costs by $1.2 trillion, and raise $2.1 trillion through direct and additional offsets.”

View photos The CFRB analyzed the health care plans of the top four Democratic candidates. (Source: CFRB) More

Through Buttigieg’s Medicare for All Who Want It plan, everyone would automatically be involved in universal health care coverage for those who are eligible. The policy would also expand premium subsidies for low-income individuals, cap out-of-pocket costs for seniors on Medicare, and limit what health care providers change for out-of-network care at double what Medicare pays for the same service. At the same time, those who still want to stay on private insurance can do so.

“This is how public alternatives work,” Buttigieg said. “They create a public alternative that the private sector is then forced to compete with.

CRFB estimated that the Indiana mayor’s plan would reduce the number of uninsured by between 20 to 30 million “by improving affordability and implementing auto-enrollment as well as retroactively enrolling and charging premiums to those who lack coverage.”

View photos Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks to the U.S. Conference of Mayors 88th Winter meeting in Washington, U.S., January 23, 2020. REUTERS/Joshua Roberts More

‘Building on Obamacare’

Joe Biden’s health care plan, described as “building on Obamacare,” has an estimated gross cost of $2.25 trillion and would add $800 billion to deficits over 10 years. The CRFB also found that “it would reduce costs by $450 billion” and “raise $1 trillion through direct and additional offsets.”

Biden’s plan would reduce the number of uninsured by 15 to 20 million Americans and reduce national health expenditures by 1%.

Some of his biggest revenue drivers in his plan include coverage expansion revenue feedback, which would create a public option, and end deductibility of prescription drug advertising. Additionally, his capital gains tax and “tax at death” would generate $550 billion.

View photos Democratic 2020 U.S. presidential candidate and former U.S. Vice President Joe Biden speaks at a campaign event at the VFW Post 7920 in Osage, Iowa, U.S., January 22, 2020. REUTERS/Shannon Stapleton More

‘Federal health expenditures would increase somewhat more’

Sen. Sanders, one of the original proponents of Medicare for All, has a plan that’s projected to add $13.4 trillion to deficits over a decade at a gross cost of $30.6 trillion. It would also raise $12.5 trillion in revenue through direct offsets and raise another $3 trillion through additional offsets.