Twitter CEO Jack Dorsey has failed to state there is clear evidence that the New York Post's story featuring Hunter Biden is false.
On Wednesday, Sen. Ron Johnson pressed Dorsey on his company's decision to block the sharing of the article, wondering why it was not considered censorship, or an attempt to influence the looming presidential election on 3 November.
"For both Mr Zuckerberg and Mr Dorsey who censored New York Post stories or throttled them back, do either one of you have any evidence that the New York Post story is part of Russian disinformation or that those emails aren't authentic?", Johnson asked.
"We don't", Twitter CEO answered.
Earlier, Dorsey already apologised for blocking the article on Twitter, saying that their action on the article "was not great", after the company received backlash from users.
Twitter not only prevented users from sharing the link to the story but also locked the New York Post out of their Twitter account and did the same to White House Press Secretary Kayleigh McEnany, who also shared the article.
President Donald Trump took to Twitter on Wednesday to once again slam Twitter for "fake trending" and failing to cover the "Biden corruption". "I'm running against the corrupt media, the big tech giants, the Washington swamp. And the Democrat Party is a part of all of them, every single one of them", Trump said at a campaign rally in Erie, Pennsylvania, on Tuesday evening.
The article, originally published on 14 October, contained allegedly leaked email correspondence between the Democrat candidate's son, Hunter Biden, and a top official at the Ukrainian energy company Burisma.
Last week, the US Senate Judiciary Committee voted to authorise its chairman to issue subpoenas that would force the CEOs of Facebook and Twitter to testify at a hearing on what the panel's Republicans call censorship.