Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) criticized his 2020 Democratic presidential rival Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE’s health care plan on Wednesday, saying it falls short of needed changes.

“It doesn't go anywhere near far enough,” Sanders told reporters in the Capitol when asked about the former vice president’s plan. “It will be expensive, it will not cover a whole lot of people.”

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The remarks mark relatively rare direct criticism of a rival candidate in the early stages of the Democratic presidential primary. Biden and Sanders are leading in early polls, with Biden occupying a more moderate lane in contrast to Sanders’s proudly leftward stances.

Biden on Monday called for giving everyone the chance to buy into Medicare, a kind of public option for health insurance that does not go as far as Sanders’s proposal to require everyone to be covered by Medicare.

“We have a system now which is dysfunctional,” Sanders added on Wednesday. “We spend twice as much per capita on health care as do the people of any other nation, and yet we have tens of millions of people uninsured, underinsured and we pay by far the highest prices in the world for prescription drugs.”

Biden on Monday framed his plan as allowing for more consumer choice, without directly mentioning Sanders.

“Your choice," Biden said. "And if the insurance company isn't doing the right thing by you, you should have another choice."

Health care is one of the major dividing lines in the emerging Democratic primary contest. Sanders has set a benchmark with his signature "Medicare for all" proposal, which some contenders like Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) have thrown their support behind.

But other candidates are declining to go that far, instead saying they think private insurance should remain as an option alongside Medicare. Biden, as well as former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE, are major backers of that approach.