The Sept. 15 summit, dubbed "United We Stand," will bring together officials, faith leaders and civil rights groups and feature a keynote speech by Biden, who will put forward a shared vision for a more united America, White House Press Secretary Karine Jean-Pierre said in a statement.

"Even as our nation has endured a disturbing series of hate-fueled attacks, from Oak Creek to Pittsburgh, from El Paso to Poway, from Atlanta to Buffalo, Americans remain overwhelmingly united in their opposition to such violence," Jean-Pierre said.

Biden, a Democrat, is seeking to highlight his recent legislative wins, including a gun safety law he signed in June, ahead of November midterm congressional elections.

Most forecasters give Republicans a strong chance of taking the House and see the Democrat-controlled Senate as up for grabs. Republican control of one or both chambers could thwart much of Biden's legislative agenda for the second half of his four-year term.