Former Vice President Joseph R. Biden plans to begin live-streaming his own briefings on the coronavirus Monday, attempting to keep his Democratic presidential run relevant while the deadly virus sidelines his campaign. He told donors in tele-fundraiser Sunday that it is time for Americans to come together in the face of a crisis, and he slammed President Trump and Republican lawmakers for botching economic rescue legislation. “This is a time for this nation to come together because, folks, we’re all in this together. This virus doesn’t care whether you’re a Democrat or Republican,” Mr. Biden, who is hunkered down...