Kamala Harris is set to announce her vice presidential running mate on Tuesday, her first major decision as a Democratic presidential candidate and another step in her bid to win the US election in November.

Sources told Reuters on Monday that Harris had narrowed her list to Pennsylvania Governor Josh Shapiro and Minnesota Governor Tim Walz after considering a final pool of candidates

A campaign official said there was no communication about the selection on Monday night, meaning Harris had not told her potential colleagues who would get the nomination. Harris is expected to appear with her running mate at an event in Philadelphia on Tuesday night.