'Sexist trash': Hillary Clinton denounces Donald Trump for tweeting doctored Nancy Pelosi video

Hillary Clinton has taken a swing at the man who defeated her in the 2016 US Presidential election for spreading "sexist trash" about another powerful woman in Washington.

President Donald Trump retweeted a video on Friday featuring heavily edited footage of Speaker of the House Nancy Pelosi speaking to reporters at a press conference.

The video, posted by Fox Business Network, zeroed in on Pelosi stumbling over a small number of words during what was a 23-minute conference. It also replayed her holding up the wrong number of fingers several times, without including the moment she corrected herself just afterwards.

It's one of many doctored videos of Pelosi shared across social media in recent days which imply the 79-year-old is suffering from physical or mental afflictions affecting her ability to do her job.

In response to Trump retweeting the video - with the caption 'PELOSI STAMMERS THROUGH NEWS CONFERENCE' - she tweeted a video of herself speaking at a Democratic Party event in Houston.

"The president and his cronies have been running around spreading a doctored video of Nancy Pelosi," she told the audience. "Now, it is sexist trash, but it is also a sign that Trump is running scared."

Clinton was the victim of a similar smear campaign during the 2016 campaign. Trump aides and fans shared videos that showed her coughing during a bout of pneumonia or blinking in response to questions from journalists, creating the perception that she was too unwell to be president.

Much like they did in 2016, both Twitter and Facebook have refused to remove edited videos of Pelosi because they don't violate either website's community standards.

There are growing calls for social media platforms to implement policies forbidding the publication of videos that have been manipulated to create a false impression, which it's believe directly contributed to the spread of 'fake news' in the lead-up to the 2016 election.