Vice President Kamala Harris will continue her explicit outreach to Republican voters on Wednesday at a Pennsylvania event with a phalanx of former Republican elected officials who have turned against former President Donald J. Trump, the Harris campaign said.

Ms. Harris will be joined at a campaign stop in Bucks County, Pa., by former Representatives Adam Kinzinger of Illinois, Barbara Comstock and Denver Riggleman of Virginia, Chris Shays of Connecticut, Jim Greenwood of Pennsylvania and Mickey Edwards of Oklahoma.

Former Lt. Gov. Geoff Duncan of Georgia and former Gov. Christine Todd Whitman of New Jersey, among others, are also expected to attend, a Harris campaign official said.

Two weeks ago Ms. Harris, the Democratic presidential nominee, held a campaign rally with former Representative Liz Cheney of Wyoming, the most prominent Republican to endorse the ticket, in Ripon, Wis., where the Republican Party was formed. The Pennsylvania event is to imbue similar symbolism: The setting will be near the site where George Washington famously crossed the Delaware River during the Revolutionary War.

President Biden used a nearby location to condemn Mr. Trump in a blistering speech attacking him for trying to overturn the 2020 election.