Biden will instead hold a solo press conference, which a White House official called "the appropriate format to clearly communicate with the free press the topics that were raised in the meeting."

The attack occurred in a busy entertainment district in the Texas capital early Saturday, authorities said. Investigators were looking into what sparked the shooting.

"Loving Day" celebrates the historic ruling in Loving v. Virginia, which declared unconstitutional a Virginia law prohibiting mixed-race marriage — and legalized interracial marriage in every state.

It's one of the oldest criminal cases cracked with the new DNA technology. The murders of teen sweethearts Lloyd Duane Bogle and Patricia Kalitzke had gone unsolved for more than 60 years.