After a rally against cuts in London, a break away group caused a scuffle during a smaller demonstration outside the Savoy hotel.
The scuffle began after a protester took a doorman's hat. The top hat was later returned to him. No one is believed to have been seriously injured during the incident.
More top news
The president will continue to fight the 'constant hostility' from the press, one of Trump's closest advisers has told ITV News.
Temperatures tumbling again tonight with a widespread sharp frost and lows of -5C or -6C and icy spots in places
Search teams were again looking for missing airman Corrie McKeague - this time joined by cadaver dogs trained to seek out human remains.