(FILES) US President Joe Biden pauses as he concludes his address to the nation about his decision to not seek reelection, in the Oval Office at the White House in Washington, DC, on July 24, 2024. Courts, bullets and verbal stumbles have made their mark on this year's US election campaign -- one of the most extraordinary in the nation's history. At 1.46 pm on Sunday, July 21, a beleaguered President Biden announces in a tweet that he will not seek reelection, yielding to intense concerns over his ability to defeat Trump in November. It makes him the first sitting president since 1968 not to seek reelection, and upends the White House race. Kamala Harris, the first female, Black and Asian-American to serve as US vice president, gains Biden's endorsement to replace him in the campaign. (Photo by Evan Vucci / POOL / AFP) (Photo by EVAN VUCCI/POOL/AFP via Getty Images)