On Thursday in Washington DC, Marco Rubio, the Secretary of State, will host an international summit on the threat posed by "the resurgence of transnational far-left terrorism.” There will be a particular focus on the loosely composed group the Trump administration calls Antifa. What is this group? Is it a significant threat? Or is there something motivating the DC summit? BBC journalist Mike Wendling joins us to discuss whether the Trump administration is right to worry about far-left groups like Antifa.

(Photo: Anti-fascist demonstrators wave an Antifa flag, which is green and has an orange, green and white circular logo in the middle, in the UK, 2016. Credit: Gareth Fuller/Press Association)

Producers: Cat Farnsworth, Aron Keller and Hannah Moore

Executive producer: James Shield

Sound engineer: Travis Evans

Senior news editor: China Collins