text:  That's NPR White House correspondent Tamara Keith. Tam, thank you. You're welcome. To Philadelphia now, where all city workers have been ordered to return to the office five days a week starting Monday. Thousands of workers are fighting the mandate and have sued the city. A Philadelphia judge heard arguments today on whether to delay the return. It is the latest flashpoint in an ongoing debate about how and where people work best. NPR's Andrea Hsu has more.