REUTERS: Joe Biden is facing fresh calls to choose a black woman for his running mate amid rising racial tensions after this week's videotaped killing of an unarmed black man by a white Minneapolis police officer.

Biden, the presumptive Democratic nominee to take on President Donald Trump in the Nov 3 election, has promised to pick a woman. Several black candidates are on the short list, including Senator Kamala Harris, former Georgia gubernatorial hopeful Stacey Abrams and Representative Val Demings.