Election 2024 updates: Harris interviewing top VP contenders Sunday, source says

Vice presidential candidate JD Vance is visiting the southern border Thursday morning in Cochise County, Arizona.

Vance and Trump have sought to attack Harris over her handling of the border -- something President Joe Biden assigned her to oversee as vice president. The border and immigration are a major issue for voters this election.

Vance discussed the border and attacked Democrats during a rally in Arizona Wednesday night.

"They suspended deportations. They stopped building the wall. They reinstated catch and release. That's how every state became a border state: They just release them into our country. They fly them first class wherever they want to go and put them up in fancy hotels," Vance claimed. "You're paying for that, too. Then they proposed amnesty for millions of illegal aliens."

-ABC News' Hannah Demissie

The Democratic National Committee's virtual voting process is underway -- a process that will formally designate Vice President Kamala Harris as the official presidential nominee of the Democratic Party.

Harris was already deemed the presumptive nominee by the DNC earlier this week after she emerged from a process, laid out by the party's Rules Committee, as the only qualified candidate.

The virtual roll call began at 9 a.m. ET Thursday and will go until 6 p.m. ET on Monday, Aug. 5.

Read more here.

Former President Donald Trump's running mate, JD Vance, defended his comments at the National Association of Black Journalists (NABJ) annual convention in Chicago Wednesday.

Ahead of his rally in Phoenix, Arizona, Vance told reporters he believes the media is "overreacting" to Trump's remarks at NABJ, where he questioned his opponent Vice President Kamala Harris' racial identity.

"I didn't know she was Black until a number of years ago when she happened to turn Black and now, she wants to be known as Black. So, I don't know, is she Indian or is she Black?" Trump said at the convention.

Vance told reporters Wednesday he found Trump's comments "hysterical" adding that he believes the former president "pointed out the fundamental chameleon-like nature of Kamala Harris."

"She is not who she pretends to be," Vance said of Harris. "She's flip-flopped on every issue. She's fake, she's phony," he added.

Vice President Kamala Harris spoke out on the campaign trail on Wednesday night, reacting to former President Donald Trump's headline-making appearance at the National Association of Black Journalists earlier in the day.

While not calling out any specific comments, Harris said that Trump's appearance at the conference "was the same old show -- the divisiveness and the disrespect."

"And let me just say, the American people deserve better," Harris added as she addressed a Houston crowd at the Sigma Gamma Rho Sorority Inc.'s Boulé. "The American people deserve a leader who tells the truth; a leader who does not respond with hostility and anger when confronted with the facts; we deserve a leader who understands that our differences, do not divide us. They are an essential source of our strength."

-ABC News' Jolie Lash