Trump will deliver remarks in Mint Hill, North Carolina, at 1 p.m. He will speak about the economy, according to a campaign release.

Later, his running mate, Sen. JD Vance, will speak in Travers City, Michigan. The event is scheduled to begin at 7 p.m.

As Harris seeks to gain ground on the economy, she will outline on Wednesday what her campaign is calling a "pragmatic" view on the issue.

Harris plans to tell voters that "as a capitalist she understands the limitations of government" and that the government must "work in partnership with the private sector and entrepreneurs," according to the senior official, granted anonymity to preview Harris's speech. The official noted Harris will make clear "she is unafraid to hold bad actors accountable if she needs to."

The vice president will also argue that her economic philosophy is "rooted in her middle-class upbringing" and contrast that with Trump's "gilded path to wealth," as part of a larger values argument, the official said.

Read more about Harris' upcoming speech here.

Harris is participating in an interview with MSNBC's Stephanie Ruhle on Wednesday, which will air on the cable network on Wednesday at 7 p.m. ET, MSNBC announced Wednesday morning.

The network frames it as her first solo network interview since she became the nominee.

Harris has done solo interviews with other news outlets: radio stations and local TV stations. Her first media interview since announcing her candidacy took place last month when she did a joint interview with Tim Walz on CNN.

-ABC News' Oren Oppenheim

Former President Donald Trump was briefed by the Office of the Director of National Intelligence earlier Tuesday on Iran's continued assassination threats against him, his campaign said in a new statement, calling the threats "real and specific."

"Intelligence officials have identified that these continued and coordinated attacks have heightened in the past few months, and law enforcement officials across all agencies are working to ensure President Trump is protected and the election is free from interference," Trump campaign spokesperson Steven Cheung wrote in the statement.

"He will let nothing stop him or get in his way to fight for the American people and to Make America Great Again," Cheung continued.

-ABC News' Soo Rin Kim