Assange is currently in Belmarsh Prison in the UK, awaiting the outcome of an appeal by the US against a British court verdict that said he could not be extradited to America to face espionage charges.
The Yahoo! News story said the drive to act against Assange came after the appointment of Mike Pompeo as CIA director.
The reporters — Zach Dorfman, Sean Naylor and Michael Isikoff — spoke to 30 former US officials to gather material for their story.
The CIA has in the past drafted plans that have raised eyebrows, with one being a plan to kill former Cuban leader Fidel Castro by using an exploding cigar.
On 4 January, British District Judge Vanessa Baraister ruled that Assange should not be extradited, saying the risk he would commit suicide in a US jail were too high.
Assange faces criminal charges for publishing classified information that was leaked to WikiLeaks by an American soldier, then known as Bradley Manning, but now, after gender reassignment surgery, known as Chelsea Manning.
Assange was arrested by British police on 11 April 2019 and removed from the Ecuador embassy where he had taken refuge. His asylum was withdrawn shortly before he was arrested and he appeared in court shortly thereafter. The US made a formal request for his extradition on 6 June 2019.