US
Candidates need 270 of 538 electoral votes to win, with swing states crucial in deciding elections between parties
Trump, 78, says Biden, 81, will refuse to quit campaign because of his ego and convention delegate support
Others hold open the possibility of choosing a different presidential candidate
Joseph Biden, currently aged 81, faces scrutiny over his age as he eyes the 2024 election
Announces $225m tranche on sidelines of D-Day events in Paris
US president says Washington, Beijing 'must work together to address global challenges,' according to White House
Saudi foreign minister says decision was purely economic and was taken unanimously by its member states
Biden says prospect of defeat could make Putin desperate enough to use nuclear weapons
The development comes just three days after US president tested negative for the disease
US president routinely bikes in the Gordons Pond area on the Delaware shore on weekends