“Joe Biden chose Kamala Harris to become his running mate for the 2020 election on August 1, two weeks before the Democratic National Convention, after keeping his choice close to his chest for months,” Politico said.
“In his announcement, Biden called Harris ‘a worthy opponent and a worthy running mate,’ alluding to the pair’s rivalry during the earlier stages of the Democratic primary.
“She will bring her experience as a prosecutor, household name recognition, and skill as a debater to the ticket.”
Ms Harris, a US Senator and former prosecutor, has long been considered the frontrunner for the vice presidential nomination.
Mr Biden has explicitly promised to choose a woman, and has strongly indicated he would prefer someone who will bring racial diversity to the ticket.
Other names on the rumoured shortlist are Senator Elizabeth Warren, Senator Tammy Duckworth, Michigan Governor Gretchen Whitmer, Representative Val Demings and former White House national security adviser Susan Rice.
At a campaign event today, Mr Biden told reporters he would name his choice “the first week in August”, which would line up with the date mentioned by Politico.
Despite her strong credentials, Ms Harris would be an awkward pick for a couple of reasons.
Ms Harris was one of the candidates running against Mr Biden for the Democratic Party’s presidential nomination earlier this year, and during that effort, she went on the attack.
“As the only black person on stage, I would like to speak on the issue of race,” she said.
“There is not a black man I know, be he a relative, a friend or a co-worker, who has not been the subject of profiling or discrimination. My sister and I had to deal with the neighbour who told us her parents couldn’t play with us because we were black.
“And I’m going to say that in this campaign, we’ve also heard — and I’m going to direct this at Vice President Biden.
“I do not believe you are a racist. And I agree with you when you commit yourself to the importance of finding common ground.
“But I also believe — and it’s personal, and it was hurtful to hear you talk about the reputations of two United States senators who built their reputations and career on the segregation of race in this country.”
That was a reference to a controversial comment Mr Biden made earlier the same month, touting his working relationship with two pro-segregation senators decades ago as proof of his ability to work constructively with the other side of politics.
“At least there was some civility. We got things done. We didn’t agree on much of anything. We got things done,” Mr Biden had told the crowd at a fundraiser.
In the 1970s and 1980s, a number of American school districts implemented mandatory bussing policies, which saw students assigned and transported to particular schools in an effort to achieve a level of racial balance.
The schools themselves had previously been segregated, and had struggled to achieve any sort of balance due to the continuing racial inequality between residential areas.
There was fierce opposition to the bussing policy from some quarters, and Mr Biden opposed the idea of a federal law mandating its implementation nationwide, arguing it was a matter for state and local governments.
“There was a little girl in California who was part of the second class to integrate her public school, and she was bussed to school every day. And that little girl was me,” Ms Harris said.
“So I will tell you that on this subject, it cannot be an intellectual debate among Democrats. We have to take it seriously. We have to act swiftly.”
Mr Biden dismissed the attack as “a mischaracterisation of my position across the board”.
“If we want to have this campaign litigated on who supports civil rights, and whether I did or not, I’m happy to do that. I was a public defender. I didn’t become a prosecutor, I left a good law firm to become a public defender,” he said.
That last jab at Ms Harris’s former career as a prosecutor brings us to the second reason she might be an awkward choice.
When she was attorney-general of California, Ms Harris took stances on some issues that no longer conform to the prevailing views of her party. For example, she did not join attempts to abolish the death penalty.
More significantly, Ms Harris did not back legislation that would have mandated independent investigations in cases where police officers killed people.
Ms Harris has spent recent weeks relentlessly promoting Mr Biden’s candidacy. That push has included emails to supporters of her now defunct presidential campaign, asking for donations to help him defeat Donald Trump.