President Biden will transfer power to Vice President Kamala Harris Friday morning for the “brief period of time” when he is under anesthesia for a “routine” colonoscopy at Walter Reed Medical Center, the White House said Friday.

The president traveled to Bethesda, Maryland, for a physical exam, one day before his 79th birthday. Biden arrived at 8:51 a.m. ET and waved to reporters who were traveling with him.

White House press secretary Jen Psaki said Biden will also undergo a colonoscopy while there.

Joe Biden is undergoing a colonoscopy at Walter Reed today

Kamala D. Harris is now Acting President of the United States of America

— Jack Posobiec (@JackPosobiec) November 19, 2021

President Biden has arrived at Walter Reed Medical Center, per @Kevinliptakcnn https://t.co/j35F0OncaZ

— Evan Schreiber (@SchreiberEvan) November 19, 2021