Kamala Harris and Donald Trump target Michigan as both try to shore up ‘blue wall’ votes

Democratic presidential nominee US Vice President Kamala Harris speaks at a campaign rally in Wisconsin (Susan Walsh/AP)

Kamala Harris and Donald Trump will both be scouring for votes in Michigan on Friday as they try to lock down support in the key political battleground.

Ms Harris, the Democratic vice president, is scheduled to begin her day in Grand Rapids for a rally with other Democratic leaders.