The UK's highest court denied Assange's bid because "the application does not raise an arguable point of law," according to a statement released by the court.
Assange facesrelating to WikiLeaks' release of confidential US military records about the wars in Iraq and Afghanistan. Assange could potentially face a 175-year jail sentence, though US officials said, if he's convicted, his sentence would likely be between four and six years.
Interior Minister Priti Patel must now ratify the extradition decision, which Assange can then challenge via judicial review, according to Reuters.
"Mr. Assange will continue the legal process fighting his extradition to the United States to face criminal charges for publishing truthful and newsworthy information," Barry Pollack, Assange's US-based lawyer, said Monday.