This lawyer is a known figure in Norway and not some guy looking for his fifteen minutes of fame. He has defended people on terrorism charges in Norway before,

This lawyer is a known figure in Norway and not some guy looking for his fifteen minutes of fame. He has defended people on terrorism charges in Norway before, and gotten them acquitted on those charges (while other lesser charges still stuck). On his twitter, he claims that the US embassy doesn't know why his visa was revoked, only that "Homeland security's computers" are telling them it's revoked. This is then connected to NSA leak by journalists. He is still waiting for a proper explanation from the US embassy.