The Health Secretary has challenged the British Medical Association (BMA) by offering it six weeks to negotiate on changes for hospital consultants and junior doctors, or face a new seven-day contract.
Doctors back a seven-day NHS service but want the government to outline how they will fund and staff it.
Chair of the British Medical Association Dr Paul Flynn said: "There is clear public support for more weekend services, but no clear plan on how this will be delivered.
“At a time when the NHS is facing a £22 billion funding shortfall, many hospitals are in the red and weekday services are under strain.
"The government must explain how they plan to expand services by up to 40% across the week.
"How will they pay for it? How will they ensure there isn’t a reduction in mid-week services? How will they put in place the support doctors need to deliver the same high standard of care over seven days?"
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.