Twitch streamer and political commentator Hasan Piker says His London plans were derailed before departure when the United Kingdom’s Home Office revoked his travel authorization. The dispute became public on June 1, when Piker, widely known online as HasanAbi, said he had been told his Electronic Travel Authorisation was no longer valid.

Piker had been scheduled to travel to London for SXSW London and other events. Instead, he said he was prevented from boarding his flight, which is a fairly efficient way to ruin an itinerary.

Why did the Home Office revoke the authorization?

According to Piker, the decision came shortly before he was due to depart. Reuters and The Guardian reported that the Home Office confirmed the move and said his presence in the UK “may not be conducive to the public good.”