The White House said today it would review a public petition to extradite American dentist Walter Palmer accused of illegally killing Cecil, Zimbabwe's favourite lion.
The petition has exceeded the required 100,000 signatures, and the White House has said it will respond to all petitions that meet that level.
White House spokesperson Josh Earnest said it is up to the Justice Department to respond to an extradition order.
The incident is currently being investigated by Zimbabwean authorities and the US Fish and Wildlife Service, who said that efforts to contact Dr Palmer have been unsuccessful.
American philanthropists have pledged to match new donations up to $100,000 to the research team who had been tracking Cecil since 2008.
Dozens of protesters gathered outside the practice of a suburban Minneapolis dentist who killed a protected lion in Zimbabwe.
A host of celebrities have taken to social media to speak out on the killing of well-known lion Cecil in Zimbabwe by a US dentist.