The White House’s direct engagement with the companies to mitigate the challenge has not been previously reported. Biden’s chief of staff Ron Klain has previously said the administration will try to work with Silicon Valley on the issue.

"Disinformation that causes vaccine hesitancy is going to be a huge obstacle to getting everyone vaccinated and there are no larger players in that than the social media platforms," said the source, who has direct knowledge of the White House’s efforts.

"We are talking to them ... so they understand the importance of misinformation and disinformation and how they can get rid of it quickly."
The Biden White House is especially trying to make sure such material "does not start trending on such platforms and become a broader movement," the source said.

A spokesperson from Facebook confirmed that the company proactively reached out to the Biden White House to offer "any assistance we can provide." A Twitter spokesperson said that the company is "in regular communication with the White House on a number of critical issues including COVID-19 misinformation."