Kamala Harris has picked Tim Walz as her running mate for the presidential election, US media has reported.

Walz, the Minnesota Governor and a former high school teacher, will become vice-president if Harris beats Donald Trump in November.

Harris interviewed several top contenders in Washington DC over the weekend and reportedly had not made up her mind until earlier today.

The announcement comes as Harris begins a tour of key battleground states, starting with a rally in Philadelphia later today where Harris will officially introduce Walz as her running mate.

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