Downing Street insists the UK will be first in line for a coronavirus vaccine developed by Oxford University if it's proven to be effective, following reports Donald Trump is considering granting emergency authorisation for it to be deployed in the US.
The vaccine is being developed by Oxford scientists and pharmaceutical giant AstraZeneca.
A Number 10 spokesman said: "We have been clear that we will only roll out a vaccine once it is deemed safe and effective by our regulators."
The UK government has struck a deal with AstraZeneca to get "first access" to it once approved, the spokesman said.
"AstraZeneca have entered into a number of agreements with other countries, they have the global licensing agreement with Oxford, but we have been clear: once it has been found to be effective, we have signed a deal for 100 million doses which means that once it is effective the UK will get first access."