The edited video, which appeared to show Joe Biden endorsing US President Donald Trump, was marked "partly false" by Facebook and "manipulated media" on Twitter.
The Harvard graduate is the first Pakistani and Muslim American to head up a major presidential campaign.
US Senator Bernie Sanders, who mounted a fierce challenge to front-runner Hillary Clinton in the 2016 primaries, will once more seek the Democratic Party’s presidential nomination in 2020.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2022 TRT World.