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.) rebuked outgoing Starbucks chairman Howard Schultz on Thursday, arguing that the businessman is "dead wrong" on his argument that Democrats should be more concerned with government spending than single-payer health care.

"I think his comment is dead wrong," Sanders said on CNN. "You have a guy who thinks that the United States apparently should remain the only major country on earth not to guarantee health care to all people."

Schultz announced this week that he would step down as Starbucks' executive chairman, fueling speculation that he could mount a bid for the White House in 2020.

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In an interview with CNBC on Tuesday, Schultz criticized the Democratic Party, saying that it appeared to be moving too far to the left and saying that some of the proposals on the left are not “realistic.”

He expressed concerns that the party was focusing too much on universal health care proposals and other social programs at the expense of fiscal responsibility.

"It concerns me that so many voices within the Democratic party are going so far to the left," Schultz said. "I ask myself how are we going to pay for these things."

Sanders, a self-declared democratic socialist, has been among the most vocal advocates in Congress for a single-payer health care system.

The idea has gained traction among some Democrats, including Sens. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J.).