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Watch as Tim Walz campaigned in Pennsylvania as Donald Trump makes a trip to the same state on Wednesday, 4 September.
Kamala Harris's VP pick joined a campaign engagement in Lancaster before travelling to Pittsburgh later in the afternoon.
Meanwhile, the former president was due to visit the Pennsylvania Farm Show Complex to record a town hall event with Fox News host Sean Hannity.
Mr Walz's events on Wednesday marked his first solo trip to the state since Ms Harris officially announced her running mate.
Philadelphia is a key battleground state for the upcoming 5 November election.
Mr Walz, Ms Harris, and their respective spouses Gwen Walz and Second Gentleman Doug Emhoff, took a bus tour of western Pennsylvania before the Democratic National Convention in August.
Mr Trump's VP pick, JD Vance, visited Philadelphia twice last month.
