Harris and Walz will attend a campaign event with United Auto Workers members in Wayne, Michigan, which represents Ford’s Michigan Assembly Plant Thursday afternoon, the campaign said.

Upon arrival, they will be greeted by President Shawn Fain and UAW board members, according to the campaign, before they deliver brief remarks.

The union endorsed Harris for president on July 31 after it had previously endorsed Biden.

This stop is their only campaign stop before heading to Phoenix, Arizona, for a rally on Friday.

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

Reps. Jason Crow, D-Colo., Jake Auchincloss, D-Mass., and Mikie Sherrill, D-N.J., who are all veterans, defended Gov. Tim Walz Thursday following attacks on his service by Sen. JD Vance and other Republicans.

Crow said the attacks coming from Republicans are "old and tired."

"They have no options but to try to do one of the worst things you can do in America, that is to attack a veteran for their service," he said adding, "We're not going to put up with it."

Auchincloss said the Trump and Vance ticket doesn't represent the values of veterans.

"I thank JD Vance for his service, but his political career and his political positions are antithetical to the values of veterans, and Donald Trump has a long track record of disparaging veterans," he said.

Sherrill said the Harris-Walz ticket is "fantastic" and one that "veterans can get behind, because we know they will continue to fight to support our veterans with legislation like the PACT Act."

Thursday marked the second anniversary of the PACT Act, which provides health care and benefits for millions of veterans injured by exposure to toxins.

-ABC News' Lauren Peller

Former President Donald Trump announced via social media that he would hold a "general news conference" slated for Thursday afternoon.

The announcement comes as Vice President Kamala Harris and Minnesota Gov. Tim Walz are campaigning in Michigan amid a battleground state blitz.

Trump's last outing on the campaign trail was in Georgia on Saturday, although he has done media interviews this week.

Republican vice presidential nominee Sen. JD Vance -- also campaigning in battleground states this week -- has been critical of Harris for not talking to the media since becoming the Democratic nominee. During his battleground state visits, he's taken several questions from the press, attempting to draw contrast with Harris.

Trump also mentioned Harris' lack of media appearances, suggesting it's because "she is unable to answer questions."

-ABC News' Kelsey Walsh

A poll from Marquette University Law School of voters nationally found Vice President Kamala Harris leading former President Donald Trump among likely voters in a 2024 general election head-to-head matchup.

Among registered voters, in a two-way matchup, Harris leads Trump by four points, 52% to 48%. Yet among two-way likely voters, the vice president leads the former president by six points, 53% to 47%.

The poll, taken from July 24 to Aug. 1, has a margin of error of +/-4.1 percentage points among registered voters; and +/-4.7 percentage points among likely voters.

The poll was taken entirely after the assassination attempt on Trump and President Joe Biden’s withdrawal from the race, and entirely before Harris announced her running mate.