Trump’s campaign on Saturday said in a statement it had been hacked.
Fresh off a newly minted Democratic ticket, Vice President Kamala Harris and her running mate, Minnesota Gov. Tim Walz, are set to go on tour, hitting several battleground states in five days -- alongside them and mirroring their schedule state by state is Republican vice presidential nominee Sen. JD Vance.
On Monday, Harris introduced Walz to a fired-up crowd in Philadelphia; Vance was also in Pennsylvania on Monday. The candidates will campaign next in Wisconsin and Michigan.
Senate Majority Leader Chuck Schumer said in a statement that Gov. Time Walz is a "great choice" to be Vice President Kamala Harris' running mate.
"Let's get to work! There's no doubt the Harris/Walz ticket will lead us to victory in November and build a future Americans can be proud of," he said in a post on X.
-ABC News' Lauren Peller
Vice President Kamala Harris told Minnesota Gov. Tim Walz in a phone call this morning that they are the "underdogs" in this race, but she's confident that together they have a winning message on reducing costs for the middle class and protecting freedom, a source close to the process told ABC News.
The source added that chemistry was a big piece of Harris' decision to select Walz.
Harris notified her team this morning that she wanted to inform Walz and the other candidates, the source said, adding that the final decision and execution was done Tuesday morning.
-ABC News' Selina Wang
Former President Barack Obama released a lengthy statement on X congratulating Gov. Tim Walz for being selected as Vice President Kamala Harris' running mate.
"[Tim Walz] believes that government works to serve us. Not just some of us, but all of us. That's what makes him an outstanding governor, and that's what will make him an even better vice president," he wrote.
"By selecting Tim Walz to be her vice president from a pool of outstanding Democrats, Kamala Harris has chosen an ideal partner -- and made it clear exactly what she stands for," Obama said.
Transportation Secretary Pete Buttigieg, who was considered as a potential Harris running mate, praised Tim Walz in a statement posted on X, calling him an "effective governor -- and also great to work with."
"I'm excited for what his Midwestern voice, military experience, and common-sense values will bring to our winning ticket, and for everything the Harris-Walz administration will deliver for Americans," he said.
-ABC News' Tommy Barone
