Vice-president Kamala Harris leads a pack of political heavyweights with big ambitions
Halting performance from president comes amid concern over age and fitness for office
Also in today’s newsletter, more Patriot systems for Ukraine, and Gates defends AI’s high energy use
Democratic and Republican parties have contingency rules but White House contest could get messy
Clash rekindles doubts about president’s fitness for gruelling campaign
Democrats already knew the risks of replacing their candidate. The upsides are suddenly clearer
With just over four months to go, the US presidential contest is tight
President’s campaign pledges ‘show of force’ while Republican rival focuses on economy
Opinion polls suggest the US economy is imploding but hard data shows something else
Millions of Americans will have 90 minutes to judge which man can still lead the nation
Presidential rivals’ protectionist plans will also pile pressure on struggling logistics sector
Also in today’s newsletter, voters with income over $100,000 more likely to trust Biden than Trump on the economy
Voters are worried about inflation in general and the cost of filling up their cars in particular
Environmentalists and sceptical locals threaten key element of US plans for green energy
President seeks to fight Trump on economy with progressive plan to make the very rich pay more
Proposal aims to make it more difficult for groups deemed a security risk to access American resources and capital
President heads to Camp David to prepare for high stakes event against Donald Trump
Also in today’s newsletter, how Joe Biden is preparing for next week’s presidential debate
A set piece clash between Biden and Trump will turn less on policies than on each candidate’s manner and appearance
Sweeping reform offers route to eventual citizenship and protection from deportation for 550,000 people
Hawkish message designed to appeal to rightwing allies and US Republicans ahead of scheduled address to Congress
Also in today’s newsletter, the candidates vie for Wisconsin’s much-coveted voters
Two candidates are neck and neck in pivotal state that could help decide the US presidency
President steps up attacks on his opponent’s character ahead of first televised debate
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