Nikki Haley recently said she is ready to campaign for Trump, despite not talking to him since June.

Trump's running mate, Sen. JD Vance, when asked about whether Haley will make an appearance, said Tuesday he would "love" to see her on the trail, but said it was up to her schedule.

Haley was Trump's last major challenger in the Republican primary. Despite hitting him hard in the final weeks of her campaign, she later endorsed him at the Republican National Convention.

And she's continued some criticism of his campaign strategy. During an appearance on Fox News, she said the racist remark about Puerto Rico by a comedian at Trump's Madison Square Garden rally was "harmful" and that the campaign "need[s] to go and tell Puerto Ricans how much, you know, they do value them."

She also said the Trump team had to improve its messaging to women.

"I mean, that this bromance and this masculinity stuff," she said. "I mean, it borders on edgy to the point that it's going to make women uncomfortable. You know, you've got affiliated PACs that are doing commercials about calling Kamala the 'C-word,' or you had speakers at Madison Square Garden, you know, referring to her and her pimps."

"That is not the way to win women. That is not the way to win people who are concerned about Trump style," Haley added.

On the tarmac at Joint Base Andrews about to depart for a day of campaigning, Harris was asked about President Joe Biden's "garbage" comment seeming to refer to Trump supporters. The White House and Biden have said he was specifically referring to the racist remarks made by some speakers at Trump's Madison Square Garden rally.

"Listen I think that first of all, he clarified his comments," Harris said. "But let me be clear, I strongly disagree with any criticism of people based on who they vote for."

"You heard my speech last night and continuously throughout my career, I believe that the work that I do is about representing all the people, whether they support me or not," she said. "And as president of the United States, I will be a president for all Americans, whether you vote for me or not."

It's a state that could tip the result of the 2024 election.

And Trump is ramping up rhetoric sowing doubt on the state's voting process.

In a post on his social media site on Wednesday morning, Trump claimed there's "cheating" happening at "large scale levels." He did not elaborate or provide evidence for his claims.

Some isolated incidents have emerged, including approximately 2,500 potentially fraudulent voter registration applications being investigated in Lancaster County, though officials stressed the system worked and that voters can be confident in the election.

-ABC News' Soorin Kim and Olivia Rubin

Harris will take her closing argument to voters on the road after a big speech at the Ellipse in Washington on Tuesday night. She holds a 12:30 p.m. ET rally in North Carolina, a 4:35 ET event in Pennsylvania and a 9:30 p.m. ET rally in Wisconsin.

Trump will also be in North Carolina for a 1 p.m. ET rally before a 7 p.m. ET rally in Wisconsin.

Looming large over the campaign trail are President Joe Biden's comments from a Vote Latino campaign call Tuesday night. His wording angered Republicans, who saw him as referring to the supporters of Trump as "garbage." The White House and Biden himself, seeking to clarify the remark, argued he was referring to the racist rhetoric made by a speaker at Trump's Madison Square Garden rally on Sunday.