 This is NPR News, supported by Hennepin Schools, serving all children K through 8th grade, with additional support to the East African, Latino, Afghanistan, and Native American communities. Enrollment information, open house event details, and more at hennepinschools.org. Good morning. Questions about President Biden's age and health are prompting more Democrats to ask him to step aside, and that's putting fresh scrutiny on Vice President Kamala Harris. How she's handling this moment on Morning Edition from NPR News.