Oh yes, I'm going to believe your source:

"The Center for Immigration Studies (CIS) is a conservative[2][3][4][5] non-profit research organization "that favors far lower immigration numbers and produces research to further those views."[6] Founded in 1985 as a spin-off from the Federation for American Immigration Reform (FAIR),[7] the center's self-described mission is to "provid[e] immigration policymakers, the academic community, news media, and concerned citizens with reliable information about the social, economic, environmental, security, and fiscal consequences of legal and illegal immigration into the United States."[8]

So this conservative organization  "...favors far lower immigration numbers and produces research to further those views." 

Gee, when you're creating "research" to support a specific result, that doesn't really sound too objective, does it?