Elon Musk has outlined why he is supportive of legal immigration to the United States, but brought up one condition. While speaking to a crowd in Pennsylvania, the South-African born businessman explained that he came to the United States as an immigrant and is pro-immigration. However, he believes that if someone is coming into the country they should be an “asset” to the nation and to society and “raise our standard of living.” Musk said: “Obviously, as someone who’s an immigrant, I’m pro-immigrant. I just want to make sure that people who come here are going to be assets to society and that…