Under tight security, the pomp and circumstance of President-elect Donald Trump's second inauguration on Monday comes eight years after his first one, but this time the most important moments will be held indoors.

The inauguration marks the official transfer of presidential power, with the executive branch changing hands from the Biden administration to the Trump administration. The 20th Amendment states that a president's four-year term ends at noon on Jan. 20, and the president-elect is sworn in shortly after.