Harris on 2020: I haven’t even decided on dinner tonight

Sen. Kamala HarrisKamala Devi HarrisKamala Harris: Trump should send officials to testify on immigration policy separating migrant families Senate panel advances Trump nominee who wouldn't say if Brown v. Board of Education was decided correctly What's wrong with the Democratic Party? Just look at California MORE (D-Calif.) dodged questions Tuesday about whether she's weighing a presidential bid, saying that she doesn't "even know what I'm having for dinner."

She was asked by MSNBC's Lawrence O'Donnell if her decision to co-sponsor a single-payer health care bill led by Sen. Bernie SandersBernard (Bernie) SandersTrump: ‘Clapper has now admitted there was spying on my campaign’ Overnight Defense: Trump decision on Korea summit coming 'next week' | China disinvited from major naval exercise | Senate sends VA reform bill to Trump Senate sends major VA reform bill to Trump's desk MORE (I-Vt.) signaled that she might mount a White House run of her own in 2020.

"The reason that I am supporting Medicare for all is really pretty basic, which is that it's, I believe, the moral and ethical right thing to do," she said. "And to do otherwise means to have a system where we're just not being smart."

"Well, I guess you'll just continue to think about what you might do in 2020 and we can talk about it the next time," O'Donnell said. 

"Lawrence, I don't even know what I'm having for dinner," Harris replied, before bursting out into laughter. 

Harris, a former California attorney general who entered the Senate in January, has been among the lawmakers rumored to be potential contenders for the Democratic presidential nomination in 2020.

Sanders, an independent who sought the Democratic nomination in 2016, pushed the notion of a single-payer "Medicare for all" health care system on the campaign trail. He is also a rumored contender for the 2020 nomination.