WATCH IN FULL: Harris and Walz make first official appearance at rally in PA | LiveNOW from FOX

Vice President Kamala Harris and her newly announced running mate, Minnesota Gov. Tim Walz, are holding their first joint rally in Philadelphia before going on a tour of battleground states this week. Subscribe to LiveNOW from FOX! Where to watch LiveNOW from FOX: Follow us @LiveNOWFOX on Twitter: Raw and unfiltered. Watch a non-stop stream of breaking news, live events and stories across the nation. Limited commentary. No opinion. Experience LiveNOW from FOX.