There was also no immediate confirmation from the Senate committee.
WikiLeaks claimed on Twitter that the letter was delivered via the USA embassy in London, although both the embassy and the senate select committee on intelligence declined to comment when contacted by Sky News.
Pamela Anderson's self-described "romantic connection" with Julian Assange, as reported by Fox News, suddenly spices up the long-running investigation of Wikileaks' connections to Russian interference in the 2016 US election.
In the invitation letter, dated August 1, the the Senate Intelligence Committee asks if Assange is "available for a closed interview" at a "mutually agreeable time and location".
"WikiLeaks" legal team say they are "considering the offer but testimony must conform to a high ethical standard, '" they said in a tweet.
WikiLeaks founder Julian Assange makes a speech from the balcony of the Ecuadorian Embassy, in central London, Britain, February 5, 2016. Those allegations have since been dropped but Assange would be arrested by British police, should he leave the embassy, for breaching bail conditions.
He fears that if he leaves the building he will be extradited to the USA for questioning over the activities of WikiLeaks, which has published reams of military and diplomatic secrets.
Assange has been living inside the Ecuadorian embassy in London since 2012, where he is wanted by the governments of other countries for a number of crimes.
WikiLeaks disseminated hacked emails from top Clinton campaign adviser John Podesta, as well as hacked emails from the Democratic National Committee.
The alleged interest comes amid an ongoing investigation by Special Counsel Robert Mueller into alleged collusion between Donald Trump's presidential campaign and Russian Federation to help him secure a victory.