Barack Obama, the former US president, sounded the alarm about Joe Biden’s ailing re-election bid almost a year before polling day, warning his former vice-president’s staff “your campaign is a mess”, a new book reveals.

The intervention came amid tensions between the Obama and Biden camps as they braced for a tough fight against Donald Trump. In the end, the ageing Biden withdrew from the race in favor of his vice-president, Kamala Harris, who was defeated by Trump.

Obama’s prescient anxiety is captured in the upcoming book 2024: How Trump Retook the White House and the Democrats Lost America by journalists Josh Dawsey, Tyler Pager and Isaac Arnsdorf, a copy of which was obtained by the Guardian.

The authors describe how Biden, trailing in opinion polls, kept hearing complaints from congressional Democrats that his campaign lacked a presence in their district. His staff in Wilmington, Delaware, were “despondent” and the president confided in one aide: “I have a leadership problem on the campaign.”