Of Mr Biden's vow to choose a woman, Mr Trump said: "Some people would say that men are insulted by that. I'm honored to join him as our party's nominee for Vice President, and do what it takes to make him our Commander-in-Chief". Back in May, Biden had a four percent lead.
The four-day Democratic National Convention will kick off next week, while the Republican Convention will begin August 24.
Before becoming a senator from California, Harris was the state's attorney general and San Francisco's district attorney before that. Gov. Gretchen Whitmer of MI was also considered an early favorite for the role, and Susan Rice, who served as National Security Advisor and United Nations ambassador during the Obama administration while Biden was vice president, has also been floated as a potential choice for the nominee. Harris's mother was a breast cancer researcher who immigrated to the United States from India in the 1960s, while her father Donald Harris, originally from Jamaica, is an economist who worked for Stanford University in the Bay Area and a staunch Marxist.
F1 70th Anniversary GP qualifying results, full grid lineup
Hamilton edged his teammate by 0.163s but the Briton's margin over third-placed man Lando Norris was over half a second. Esteban Ocon was ninth for Renault ahead of Spaniard Carlos Sainz who completed the top-10 for McLaren .
"Look, I thank God I'm in great health". You know, I work out every morning. Almost all Democrats, 90%, say expanding vote-by-mail is a good idea but few Republicans, 20%, agree. And as president, he'll build an America that lives up to our ideals.
Biden campaign spokesman Andrew Bates said Mr Trump is "easily threatened". Kamala Harris as his running mate.
Only two other women have been nominated vice presidential candidates-Sarah Palin by the Republican party in 2008 and Geraldine Ferraro by the Democrats in 1984 - and neither made it into the White House.