BBC: Q&A: Arrest of Wikileaks founder Julian Assange
What would happen if the United States made a request to extradite Mr Assange from the UK?
When there are two competing claims to extradite someone, the home secretary has to decide which takes precedence. In making that decision, he or she will take into account the relative seriousness of the offences for which the person's extradition is sought, where the offences were committed, and the timing of the two requests.
Extradition to the United States is governed by the Extradition Act 2003. This provisions governing extradition between the two countries has been criticised for creating a lop-sided relationship under which the United States no longer has to provide prima facie evidence - normally in the form of witness statements - that an offence has been committed.
That criticism was voiced in relation to the case of the so called 'Nat West Three'.
If Mr Assange is extradited to Sweden and the United States wanted to extradite him from there, they would need the consent of the United Kingdom.
Such an extradition would be conducted in accordance with Swedish law and the extradition arrangements agreed between Sweden and the United States.
It has been suggested that it would be easier for the United States to extradite Mr Assange from Sweden than from the United Kingdom.
This does not appear to be the case as the United States would have to show that there were reasonable grounds for the extradition from Sweden. This is arguably a higher test than the test which applies when an extradition is sought from the United Kingdom.