https://techcrunch.com/2020/03/08/twitter-applies-its-new-manipulated-media-label-to-video-retweeted-by-trump/

A video retweeted by Donald Trump is the first to be marked with Twitter’s new “manipulated media” tag. The company formally unveiled a new policy last month that said media that has been “significantly and deceptively altered or fabricated” is likely to be labeled if it is determined to be deliberately misleading.

The video, originally tweeted by White House director of social media Dan Scavino and shared by Trump, used footage taken during a speech by Democratic presidential candidate Joe Biden and was edited to make it appear as if Biden, speaking in Kansas City on Saturday, misspoke and accidentally endorsed Trump for re-election.