 President Biden has tested positive for COVID. He was in Las Vegas campaigning. The White House said he developed a runny nose and a cough, so he took a COVID test and got the news. And now he's back at his beach house in Delaware, where the White House says he'll continue his normal duties. But this comes at a time when very little in his campaign is actually normal. The health of this president and his ability to seek a second term is definitely under the microscope. NPR senior White House correspondent Tamara Keith is with us now from Milwaukee. Good morning, Tamara.