Entrepreneur Mark Cuban is the latest in a recent string of billionaires to challenge Massachusetts Sen. Elizabeth Warren, by firing off a tweet about her Medicare-for-all proposal on Monday.

Cuban put a question out to his followers about whether he and his family should have to pay for health care.

Musician John Legend responded to him, saying it’s not free and that his taxes would go toward paying for the proposal. In response, Cuban said the wealth tax “isn’t enough to cover it.” He then floated the idea that if he and Legend paid for their own health care, everyone else would be taxed less or their tax dollars could be put toward other things like fighting climate change.

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