tl;dr: he has issues with FWD.us because he believes that letting in more skilled immigrants is unfair to people who are unskilled. He also has some vague concept that skilled immigrants take jobs away from uneducated Americans. Because, you know, hiring 10 high school drop outs can totally replace one foreign PhD whom you can't hire because of immigration bullshit.
I think he is wrong about this premise, since this 1 million people could help create jobs, and feed even more people (service industry, etc). Like others said: It's important for these people to focus on the game they know, and that's mostly information and technology.