 The vice president reached out to Vance after he became the GOP vice presidential nominee. She left a congratulatory voicemail. He returned the call, and the two exchanged pleasantries. Harris urged Vance to accept a debate invitation either next week or next month. According to people familiar with the matter, the two campaigns are still working on terms for a debate. Meanwhile, Vance will be the keynote speaker here at the Republican National Convention Wednesday night, when he will formally accept the vice presidential nomination. Greg Clugston, Milwaukee.