President Trump’s July 13 visit to the U.K. will be defined by policy meetings, but also massive protests. After all, Trump is unpopular in Britain, and a range of far-left professional protest groups are organizing to disrupt his visit.

That means the U.K. and U.S. security services will face an unusual security challenge in ensuring that Trump can meet with Prime Minister Theresa May and Queen Elizabeth II without incident, then head home.