We must elect a president… who will bring all of us together — Black, White, Latino, Asian, Indigenous — to achieve the future we collectively want. We must elect Joe Biden,” she said.

Former U.S. President Barack Obama, speaking just before Harris, also delivered a sharp rebuke of his Republican successor, saying Trump had used the power of his office only to “help himself and his friends.”

Obama, whose vice president was Biden from 2009-2017, said he had hoped that Trump would take the job seriously, come to feel the weight of the office, and discover a reverence for American democracy.

“For close to four years now he has shown no interest in putting in the work… no interest in treating the presidency as anything but one more reality show that he can use to get the attention he craves,” Obama said, in unusually sharp criticism of a sitting president by a former president.

Harris’ nomination capped the third night of a party convention that has featured a crush of women headliners, moderators and speakers, showcasing the growing power of women in politics and in the Democratic Party. Biden leads Trump in opinion polls, bolstered by a big lead among women voters.

Biden, 77, would be the oldest person to become president if he is elected, leading to speculation he will serve only one term. The nomination for vice presidency would make Harris, 55, a potential top contender for 2024.

The speech by Harris served as a reintroduction to the country after her unsuccessful White House bid. Harris outlined her background as a child of immigrants from India and Jamaica who as a district attorney, state attorney general and now vice-presidential candidate shattered gender and racial barriers.