evidence: For some social media users, something was missing from President Joe Biden’s letter announcing his exit from the presidential race: the presidential seal. [...] But the letter’s absence of a presidential seal doesn’t prove that it didn’t come from Biden, or that it wasn’t "Biden’s choice." Unlike Nixon’s decision to resign from the presidency, Biden was discontinuing only his campaign; he continues to serve as president. Biden’s letter was a matter handled by his reelection campaign, not his presidential office. [...] We rate the claim that the lack of a presidential seal on Biden’s letter announcing his exit from the presidential race proves it wasn’t authorized False.