A somewhat awkward moment on the campaign trail — when Joseph R. Biden Jr. played a few bars of “Despacito” from his phone after being introduced by its singer, Luis Fonsi — took a turn early Wednesday morning when President Trump shared a manipulated video of the moment with N.W.A.’s anti-police anthem “____ tha Police” dubbed in.
The doctored video, which Mr. Trump shared twice, was in line with his frequent attempts to suggest that Mr. Biden opposes law enforcement, including his false claim that Mr. Biden wants to defund the police — a position the former vice-president has repeatedly emphasized that he opposes.
As a senator, in fact, Mr. Biden was the architect of much of the hard-line criminal justice legislation of the 1980s and 1990s, a fact that some progressive groups have criticized.
“What is this all about,” Mr. Trump wrote in a message that accompanied the video. Twitter later added a “Manipulated media” warning to the video.
Mr. Biden was appearing at a Hispanic Heritage Month event in Kissimmee, Fla., where he had traveled in a bid to shore up support among Latino voters in the increasingly Democratic central part of the state and to unveil his plan to support Puerto Rico.
The event’s participants included the actor Eva Longoria and the singer Ricky Martin, as well as Mr. Fonsi, who urged people to vote.
Mr. Trump’s amplification of the video followed another retweet that appeared to mark a new low in the campaign. On Tuesday, the president shared a GIF of Mr. Biden touching a woman’s shoulder at an event with the hashtag #PedoBiden, promoting a baseless smear against Mr. Biden and embracing a fringe theory promoted by QAnon, the far-right conspiracy movement.
And on Wednesday, he shared another doctored video of Mr. Biden. The video paired footage of Mr. Biden’s speech on climate change and the wildfires with animation that appeared to blame Antifa for starting the fires.