Why does charles kikuchi refer to james fisk and members of the joint immigration committee as "so-called americans"?

Charles Kikuchi was worried that he would lose his right to vote during his internment. He said that James Fisk of Joint Immigration Committee has arranged a protest to disagree or oppose the right of the Japanese Americans to vote through an absentee ballot. He thought that they were stabbing them in the back and there should be a different or separate concentration camp for such so-called Americans. He also thought that they were a lot more dangerous than those Japanese in the US. 

Amuslim warrior especially : one victorious in battle against the opponents of islam —often used as a title of honor.