1. Joe Biden X . https://x.com/JoeBiden/status/1815080881981190320
2. The Economist/You Gov poll. https://docs.cdn.yougov.com/8ssfdycdra/econtoplines.pdf
3. ABC news. Biden and Trump tied despite debate, as 67% call for president to drop out: POLL. https://abcnews.go.com/Politics/biden-age-campaign-poll/story?id=111825221
4. Fitness to lead: the health of US presidents
5. Bloomberg UK. Presidential Candidates Shouldn’t Have Health Secrets https://www.bloomberg.com/opinion/articles/2024-07-03/joe-biden-donald-trump-health-issues-shouldn-t-be-a-mystery-to-voters