A combination of photos taken at the National Mall shows the crowds attending the inauguration ceremonies to swear in U.S. President Donald Trump at 12:01pm (L) on January 20, 2017 and President Barack Obama on January 20, 2009, in Washington, DC, U.S. REUTERS/Lucas Jackson (L), Stelios Varias TPX IMAGES OF THE DAY - RTSWJVI

A combination of photos shows the crowds attending the inauguration ceremonies of U.S. President Donald Trump and President Barack Obama