The video shows Ms Pelosi’s speech at a Centre for American Progress event which was slowed down to make her voice sound slurred as though she was drunk. During her speech, Ms Pelosi was talking about Donald Trump’s refusal to cooperate with congressional investigations, according to the MailOnline. The House Speaker believes the President’s refusal to cooperate was the equivalent to a “cover-up”.
One version of the video posted on a Facebook page called Politics WatchDog was viewed more than 2 million times and was shared more than 50,000 times.
On Friday, Ms Pelosi’s daughter Christine hit out at Republicans and their followers for sharing the edited video of her mother, who she claims does not drink alcohol.
She tweeted: “Republicans and their conservative allies have been pumping this despicable fake meme for years.
“Now they are caught. #Factcheck. Madam Speaker doesn’t even drink alcohol!”
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The footage has since received 23,000 comments with social media users asking whether she was “drunk” or saying “she needs an intervention”.
Trump’s personal attorney Rudy Giuliani tweeted a link to the altered video on Thursday commenting on the speech.
He said: “What is wrong with Nancy Pelosi? Her speech pattern is bizarre.”
The tweet was later deleted with Mr Giuliani apologising for circulating the video.
Facebook has admitted its failures to combat fake news in the lead-up to the 2016 election, and has since introduced a system to stop the flow of false material.
However, on Friday the social media platform said the video does not technically break any rules because there is not a policy against posting fake content on the platform, according to the Huffington Post.
The video has been allowed to remain on Facebook but a third-party fact-checking company said it was misleading.
A spokesman for the platform said: “There’s a tension here: we work hard to find the right balance between encouraging free expression and promoting a safe and authentic community, and we believe that reducing the distribution of inauthentic content strikes that balance.
“But just because something is allowed to be on Facebook doesn’t mean it should get distribution. In other words, we allow people to post it as a form of expression, but we’re not going to show it at the top of the News Feed.”
Instead of being deleted, the video will be made harder to find on the platform.