 It's 607. It's Morning Edition from NPR News. I'm Ian Martinez in Los Angeles, California. And I'm Michelle Martin in Washington, D.C. Good morning. Coming up, President Biden leaves the campaign trail after testing positive for COVID, just as more people call for him to leave the race altogether. But first, three nights down, one to go at the Republican National Convention in Milwaukee. And so tonight, Mr. Chairman, I stand here humbled.