Rightwing populists are on the rise across Europe. With European parliamentary elections approaching, they are being offered help from Donald Trump's former chief strategist, Steve Bannon. Over the last four months, the Guardian's Paul Lewis followed his operation in Brussels, Rome and Venice – challenging Bannon over his media hype and the legality of his intervention. Subscribe to The Guardian on YouTube ► is.gd/subscribeguardian Today in Focus podcast ► www.theguardian.com/news/series/todayinfocus Support the Guardian ► theguardian.com/supportus Sign up for the Guardian documentaries newsletter ► www.theguardian.com/info/2016/sep/02/sign-up-for-the-guardian-documentaries-update The Guardian ► www.theguardian.com The Guardian YouTube network: Guardian News ► is.gd/guardianwires Owen Jones talks ► bit.ly/subsowenjones Guardian Football ► is.gd/guardianfootball Guardian Sport ► bit.ly/GDNsport Guardian Culture ► is.gd/guardianculture