The controversy over Cox's death has not stopped the party from engaging in repeated "Christian patrols," in which members burst into mosques screaming and passing out Bibles. Britain First has also publicly boasted that its members would stalk public officials and political candidates who are Muslim, supposedly to determine if they have ties to terrorist organizations.

"Our intelligence led operations will focus on all aspects of their day-to-day lives and official functions, including where they live, work, pray and so on," the party wrote on its website, according to the Daily Telegraph.

Despite its failure to win any of the elections for which it has fielded candidates, and its tiny dues-paying membership, Britain First has developed a large online following. Nearly 2 million people have "liked" the group on Facebook as of this writing, a direct parallel to the small but web-savvy "alt-right" movement of white nationalists in the United States.

Trump does not follow Britain First or Jayda Fransen, its most prominent representative and the source of the tweets he quoted. Far-right columnist Ann Coulter does, however, and hers is one of the few Twitter accounts that Trump personally follows. Just a few hours before Trump promoted Fransen's clips, Coulter had retweeted one of them.