Thousands of passport workers are striking in a row over staff numbers, as efforts to clear an ongoing backlog in applications continue.
The Home Office claimed the action could jeopardise people's holiday plans.
The Public and Commercial Services Union (PCS) said poor staffing levels were partly responsible for the delays earlier this year.
Permanent jobs need to be "put back" into the passport office if another backlog is to be prevented, according to the union which represents their workers.
Mike Jones, from the PCS union, said passport office employees were walking out because there needed to be "a permanent solution" to the staffing shortages which had caused the original backlog.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.