Biden and Harris share another impromptu encounter
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They could soon be facing off in the 2020 Democratic primary, but for now, Sen. Kamala HarrisKamala HarrisObama looks to give new momentum to McAuliffe Kamala Harris engages with heckler during New York speech Biden's safe-space CNN town hall attracts small audience, as poll numbers plummet MORE and Joe BidenJoe BidenOvernight Energy & Environment — Presented by American Clean Power — Methane fee faces negotiations White House rejects latest Trump claim of executive privilege The No Surprises Act:  a bill long overdue MORE are facing each other — bumping into one another for the second time in as many months.

An aide for the California Democrat — who launched her presidential bid last month — tweeted a photo Thursday of her boss engaged in a chance encounter on the train with the former vice president:

Harris’s sister also shared a snapshot of Biden and the senator, who appeared to be exchanging pleasantries:

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Back in December, Harris’s communications director, Lily Adams, tweeted, “You just never know who you might run into in DC…” with a photo of the two political VIPs smiling together.

Recent polling showed Biden — who has not announced any plans to run — at the top of a field of potential 2020 Democratic candidates in Iowa. In the poll, Biden led Harris, his closest competitor, by 11 points.