Vice President Kamala Harris took to Instagram to announce Minnesota Gov. Tim Walz as her vice presidential running mate. Her X page was also updated with a new social wrap that highlights her vice presidential pick, along with a new poster that features the two.

"I am proud to announce that I've asked [Gov. Tim Walz] to be my running mate," Harris wrote on Instagram.

"One of the things that stood out to me about Tim is how his convictions on fighting for middle class families run deep. It's personal," she continued.

"He grew up in a small town in Nebraska, spending summers working on his family's farm. His father died of cancer when he was 19, and his family relied on Social Security survivor benefit checks to make ends meet. At 17, he enlisted in the National Guard, serving for 24 years. He used his GI Bill benefits to go to college, and become a teacher. He served as both the football coach and the advisor of the Gay-Straight Alliance," Harris wrote.

"I share this background both because it’s impressive in its own right, and because you see in no uncertain terms how it informs his record. He worked with Republicans to pass infrastructure investments. He cut taxes for working families. He passed a law to provide paid family and medical leave to Minnesotan families," she continued. "He made Minnesota the first state in the country to pass a law providing constitutional abortion protections after the Supreme Court overturned Roe v. Wade, and as an avid hunter, he passed a bill requiring universal background checks for gun purchases."

"But what impressed me most about Tim is his deep commitment to his family: Gwen, Gus, and Hope. Doug and I look forward to working with him and Gwen to build an administration that reflects our shared values," she said.

-ABC News' Gabriella Abdul-Hakim, Fritz Farrow and Will McDuffie

The Trump campaign sent a fundraising email from Sen. JD Vance on Tuesday with the subject line, "I will wipe the floor with Tim Walz."

"I have three words for Tim Walz: Bring. It. On," the fundraising email says.

-ABC News' Lalee Ibssa

Pennsylvania Gov. Josh Shapiro will attend tonight's rally in Philadelphia and "will do everything he can" to support the Harris-Walz ticket, someone familiar with the campaign's thinking told ABC News.

-ABC News' Will McDuffie

Minnesota Rep. Dean Phillips, who was one of President Joe Biden's few primary challengers this cycle, said in a post on X on Tuesday morning that he was "thrilled" by the reports that his "friend" Tim Walz would be Kamala Harris' VP pick.

"I'm thrilled by reports that my friend and governor will be America's next Vice President," Phillips posted, along with a photo of them together.

"Tim is a common-sense, competent and experienced leader whose refreshing normal-ness will be a great contrast to the tiresome weirdness. Let’s go!" he wrote.

Walz and Phillips never served in the House of Representatives together. Walz left his 1st Congressional District seat in 2019, when Phillips was coming in to serve the 3rd District.

Phillips has endorsed Harris' White House bid.

-ABC News' Isabella Murray