text:  I believe politics ought to be an arena for peaceful debate. The presidential campaign is about to be back in full gear. Tamara Keith, NPR News. Donald Trump has already arrived in Milwaukee as the Republican National Convention kicks off. He and Biden spoke over the weekend. NPR has learned their conversation was brief and that Biden said it was good and that Trump said it was respectful. Trump is expected to be named the GOP's official presidential candidate this week. Several supporters gathered yesterday in Milwaukee.