Harris continues to harness star power as she focuses on battleground states

Kamala Harris with criss-cross the US in the final days of campaigning (Paul Sancya/AP)

Kamala Harris and Tim Walz will criss-cross the United States to visit all seven battleground states in the coming days, part of a final blitz before the US presidential election on November 5.

Ms Harris, the Democratic presidential nominee, was spending Sunday in Philadelphia, attending church services in the morning and visiting a barbershop.