Trump says he 'shouldn't have left' the White House

Speaking at an electrical workers union in southern Wisconsin Friday, Vice President Harris stressed the importance of the next four days before Election Day.

“Nobody can sit by the sidelines,” she urged.

Harris said her priority is “bringing down your cost of living," reiterating she will "always put the middle class first."

The vice president discussed her intent to “eliminate unnecessary degree requirements for federal jobs.”

“And I will challenge the private sector to do the same,” she said.

Harris cited the Foxconn facility former President Donald Trump had promised to build in Wisconsin, but which never materialized – an example she used to label him, “All talk, no walk.”

"He said Wisconsin would soon be home to a manufacturing plant that he called again, Donald Trump language, 'the eighth wonder of the world,'" she said.

Harris urged the union workers to “pay attention to what [Trump] has actually done.”

"Here's the bottom line, Donald Trump's track record is a disaster for working people, and he is an existential threat to America's labor," she said.

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

Arizona Attorney General's Kris Mayes is looking into whether former president Donald Trump comments about Rep. Liz Cheney violated state law, her office told ABC News Friday.

Trump called Cheney a "war hawk" and said she should face "nine barrels," appearing to suggest a firing squad.

Mayes' office did not immediately provide further details about their probe.

-ABC News' Oren Oppenheim

Trump is offering a similar spin as his campaign on his criticism of Liz Cheney's position on U.S. military entrance into foreign countries.

"All I'm saying about Liz Cheney is that she is a War Hawk, and a dumb one at that, but she wouldn't have 'the guts' to fight herself," Trump wrote on his social media platform.

"It's easy for her to talk, sitting far from where the death scenes take place, but put a gun in her hand, and let her go fight, and she'll say, 'No thanks!'" Trump wrote.

-ABC News' Lalee Ibssa, Soorin Kim and Kelsey Walsh

Speaking to reporters ahead of an afternoon of campaigning in Wisconsin, Harris slammed Trump for his recent comments attacking Liz Cheney and other political opponents.

"This must be disqualifying," Harris said. "Anyone who wants to be president of the United States, who uses that kind of violent rhetoric, is clearly disqualified and unqualified to be president."

"Representative Cheney is a true patriot who has shown extraordinary courage in putting country above party," she added. "Trump is increasingly, however, someone who considers his political opponents the enemy, is permanently out for revenge and is increasingly unstable and unhinged."