House Oversight Committee Chairman James Comer launched an investigation into the Biden-Harris administration for allowing Ukrainian President Volodymyr Zelenskyy to fly on a military plane to Pennsylvania earlier this week.

“The Committee seeks to determine whether the Biden-Harris Administration attempted to use a foreign leader to benefit Vice President Harris’s presidential campaign and, if so, necessarily committed an abuse of power,” Comer said in a statement Wednesday.

The committee sent letters to Attorney General Merrick Garland, Secretary of Defense Lloyd Austin and White House Counsel Edward Siskel. Chairman Comer is requesting documents, information and communications about Zelenskyy’s visit to the U.S. in September.

-ABC News' Lauren Peller

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