FILE - Anti-Brexit demonstrators hold a placard showing current Prime Minister Boris Johnson as the Joker while they take part in a "People's Vote" protest march, in London, Oct. 19, 2019. Outgoing U.K. Prime Minister Boris Johnson has been the bane of Brussels for many years, from his days stoking anti-European Union sentiment with exaggerated newspaper stories to his populist campaign leading Britain out of the bloc and reneging on the post-Brexit trade deal he himself signed. (AP Photo/Matt Dunham, file)