The former president made the remarks during a campaign rally in Pennsylvania.
With two days to go until Election Day, the candidates making in their final appeaks to voters over the weekend.
After popping up on "Saturday Night Live," Vice President Kamala Harris will campaign in battleground Michigan on Sunday. Former President Donald Trump is hitting three swing states on Sunday: Pennsylvania, North Carolina and Georgia.
As of 9 p.m. ET on Sunday, more than 77 million Americans have voted early, according to the Election Lab at the University of Florida.
Of the total number of early votes, 42,654,364 were cast in person and 35,348,858 were returned by mail.
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."
The U.S. Capitol Police Union is urging the U.S. Capitol Police to be prepared to tackle any issue that arises on or after Election Day.
"The Department must communicate and work with rank-and-file officers as we prepare for this election, the certification and Inauguration -- we cannot repeat the failures of four years ago," U.S. Capitol Police Chief Union chairman Gus Papathanasiou said in a statement released on Friday.
On Jan. 6, 2021, over 140 Capitol and D.C. Metropolitan Police officers were injured. One officer died the next day and several others took their lives in the days after the attack, according to the union.
"Our officers will be out in force to protect the Capitol Complex, Members of Congress and their staffs," Papathanasiou said. "We trust our fellow Americans to support law enforcement by supporting and respecting our officers by allowing every vote to be counted in a safe, secure election process. There is no place for violence in our elections."
-ABC News' Luke Barr
