Presidential candidate, Joe Biden, on Tuesday named Kamala Harris, an African American US senator from California, as his choice for vice president, ending his long search for a Democratic partner to challenge President Donald Trump in November.

“I have the great honor to announce that I’ve picked @KamalaHarris — a fearless fighter for the little guy, and one of the country’s finest public servants — as my running mate,” Biden, 77, said on Twitter.

His team announced that the two Democrats will deliver remarks on Wednesday in Wilmington, Delaware as they kick off their campaign to win the elections.

Posting on Twitter shortly after the announcement, Harris said she was “honored” to join Biden as nominee for vice president, and would “do what it takes to make him our Commander-in-Chief.”

“@JoeBiden can unify the American people because he’s spent his life fighting for us. And as president, he’ll build an America that lives up to our ideals,” she wrote.

For Harris, being elevated onto a Democratic presidential ticket is the political moment of a lifetime. And if they win, the 55-year-old Californian becomes the automatic frontrunner in the race for the 2024 or 2028 Democratic nomination.

Harris has been a barrier-breaker for much of her political career.

Her parents were immigrants — her father from Jamaica, her mother from India. She was the first black woman elected as California’s attorney general, and only the second black woman, and the first woman of South Asian heritage to be elected to the US Senate.

Previously, Harris had clashed with Biden during the first Democratic debate of the 2020 race, chiding the former senator over his opposition to 1970s busing programs that forced integration of segregated schools.

This provided her with a breakout moment which was short-lived: Harris dropped out of the race in December 2019 and endorsed Biden in March.

Despite their debate clash, Biden has made it clear he does not hold a grudge against her rather her described Harris as a “first-rate intellect, a first-rate candidate and a real competitor.”