terrific business leader and great philanthropist and he wants to run for president, period. that could be his motivation. >> and bloomberg is one of the billionaires that would have to pay more in taxes under warren's 52 trillion dollars medicare for all plan. arthel? arthel: christina, senator warren has been getting flak from other top tier democrats regarding that plan; right? >> that's right. she's been getting a lot of backlash. in a radio interview this week biden's called warren's healthcare plan unrealistic and said she has a elitest my way or the highway attitude. the two have been starring since the beginning of the month -- sparring since the beginning of the month. biden in a post on the website medium said without naming names that a task like warren's represented a quote angry unyielding viewpoint a reare -- remark warren supporters say has sexist overtones.