Culture crusaders: who's who in Trump's gun violence roundtable

Meeting will include campaigners seeking to tie mass shootings to violence in games and movies - despite research failing to show a link

As Donald Trump convenes a meeting on Thursday to address violence in video games, in the wake of last month's Florida school shooting, those in attendance will include a group that argues the Muppets drink too much, and another committed to exposing strident liberal bias on television.

The president's round table at the White House will be the latest in a series of discussions on school safety after a gunman left 17 dead at Marjory Stoneman high school in Parkland on 14 February.